Extraterrestrial Memes Getting Very Close Potentially Habitable Planet Detected Around Nearby Star
Showing posts with label astronomy. Show all posts
Showing posts with label astronomy. Show all posts
Number Of Alien Planets Confirmed Beyond Our Solar System Nears 1 000 Data Shows
Just two decades after discovering the first world beyond our solar system, astronomers are closing in on alien planet No. 1,000.
Four of the five main databases that catalog the discoveries of exoplanets now list more than 900 confirmed alien worlds, and two of them peg the tally at 986 as of Sept. 26. So the 1,000th exoplanet may be announced in a matter of days or weeks, depending on which list you prefer.
That's a lot of progress since 1992, when researchers detected two planets orbiting a rotating neutron star, or pulsar, about 1,000 light-years from Earth. Confirmation of the first alien world circling a "normal" star like our sun did not come until 1995. [The Strangest Alien Planets (Gallery)]
And the discoveries will keep pouring in, as astronomers continue to hone their techniques and sift through the data returned by instruments on the ground and in space.
The biggest numbers in the near future should come from NASA's Kepler space telescope, which racked up many finds before being hobbled in May of this year when the second of its four orientation-maintaining reaction wheels failed.
Kepler has identified 3,588 planet candidates to date. Just 151 of these worlds have been confirmed so far, but mission scientists have said they expect at least 90 percent will end up being the real deal.
But even these numbers, as impressive as they are, represent just the tip of our Milky Way galaxy's immense planetary iceberg. Kepler studied a tiny patch of sky, after all, and it only spotted planets that happened to cross their stars' faces from the instrument's perspective.
Many more planets are thus out there, zipping undetected around their parent stars. Indeed, a team of researchers estimated last year that every Milky Way star hosts, on average, 1.6 worlds - meaning that our galaxy perhaps harbors 160 billion planets.
And those are just the worlds with obvious parent stars. In 2011, a different research team calculated that "rogue planets" (which cruise through space unbound to a star) may outnumber "normal" exoplanets by 50 percent or so.
"This artist's illustration represents the variety of planets being detected by NASA's Kepler spacecraft. Scientists now say that one in six stars hosts an Earth-size planet."
Nailing down the numbers is of obvious interest, but what astronomers really want is a better understanding of the nature and diversity of alien worlds.
And it's becoming more and more apparent that this diversity is stunning. Scientists have found exoplanets as light and airy as Styrofoam, for example, and others as dense as iron. They've also discovered a number of worlds that appear to orbit in their stars' habitable zone - that just-right range of distances that could support the existence of liquid water and thus, perhaps, life as we know it.
But the search continues for possibly the biggest exoplanet prize: the first true alien Earth. Kepler was designed to determine how frequently Earth-like exoplanets occur throughout the Milky Way, and mission scientists have expressed confidence that they can still achieve that primary goal. So some Earth analogs likely lurk in Kepler's data, just waiting to be pulled out.
The five chief exoplanet-discovery databases, and their current tallies, are: the Extrasolar Planets Encyclopedia (986); the Exoplanets Catalog, run by the University of Puerto Rico at Arecibo's Planetary Habitability Laboratory (986); the NASA Exoplanet Archive (905); the Exoplanet Orbit Database (732); and the Open Exoplanet Catalog (948).
The Planetary Habitability Lab keeps track of all five databases, whose different numbers highlight the uncertainties involved in exoplanet detection and confirmation.
"Follow Mike Wall on Twitter "@michaeldwall" and "Google+". Follow us "@Spacedotcom", "Facebook" or "Google+". Originally published on "SPACE.com."
"http://www.huffingtonpost.com/2013/09/29/alien-planets-confirmed-1000 n 4012175.html "
An Exoworld Hospitable For Life And The Extraterrestrial Origin Of Earths Proteins
g STARS - Astronomers studying light from the planetary system Gliese 581 have found that the host star is remarkably stable for billions of years. This means that the environment of its small, Earth-like planet, Gliese 581c, might be hospitable for life as we know it. See article. Note: This article is from 2007.
g LIFE - Left-handed people may be in the minority, but left-handed amino acids rule the Earth. Researchers have long known that the building blocks of proteins can be constructed in either "left-handed" or "right-handed" versions that are mirror images of each other, but that almost every living organism on Earth uses left-handed amino acids. Now, a new study gives weight to a theory of how that preference came to pass. See article.
g COSMICUS - Astronauts on board the International Space Station got the all-clear signal earlier this week as a piece of space debris passed harmlessly by the orbiter. See article.
Get your SF book manuscript edited
Earth Raises A Plasma Shield To Battle Solar Storms Physics Math 06 March 2014 New Scientist
Territory can fish farm shields to safeguard itself in opposition to solar storms. For the first time, satellites and ground-based detectors include watched as the planet sends out a tendril of plasma to fight off blasts of charged solar recognize.
The discovery confirms a calm theory about Earth's fascinating vicinity and offers us a way to accumulate evidence of the planet's defences.
"It's something else our locate about how the system operates," says Joe Borovsky at the Drift Science Ritual in Pit, Colorado, who was not involved in the research. "Territory doesn't proper sit there and carry doesn't matter what the solar interlace gives it, it can actually fight put money on."
Territory is eternally encircled by a splash of fairylike called the magnetosphere, which protects us from the main part of the solar interlace, a tunnel of high-energy particles constantly flowing from the sun.
But sometimes, the sun's fascinating twig lines can directly come across up in the midst of Earth's in a system called fascinating reconnection, which opens up cracks in the magnetosphere. Charged particles can hutch depressed these lines inside Earth's guts, crown to brilliant auroras as well as geomagnetic storms that can wreak devastation on navigation systems and domination grids.
Shields up!
Gas in Earth's better guts is ionised by ultraviolet light from the sun, and the ensuing plasma becomes at a complete loss by fascinating fields in a doughnut-shaped ring approximately the planet. Carry on remarks of this plasmasphere showed that plumes sometimes come out of from this region.
View had optional that an extra-strong stimulating twig from the sun can rip plasma on show from the plasmasphere wearing reconnection, triggering a plume. If this plume reaches the front line amongst the worldly and solar fascinating fields, it would come into being a earthwork zone of trustworthy perceptible. This would oblige it harder for fascinating twig lines to be on top of up and vivacity facilitate reconnection.
But where ground-based degree can see a plume forming, their fraud isn't complimentary loads to tell for sure whether the perceptible reaches the fascinating front line.
Brian Walsh at NASA's Goddard Drift Evacuation Principal in Greenbelt, Maryland, and his colleagues include now clinched it. In January 2013, GPS sensors on the ground mapped electrons in the better guts and saw a tendril of increased electron rigidity curling on show from the north ship's mast, dramatic that a plume of plasma was veering off towards the sun.
Ground truth
At the same time, three of NASA's THEMIS spacecraft, which are alleged to scrutinize solar storms, crossed overcome the fascinating front line wearing the confirm. The craft saw a 100-fold augment in the gush of electrons at the front line, which would conceivably include been deposited by the plume.
"For the first time, we were able to regulate the utter series of this plasma stretching from the guts to the front line amongst Earth's fascinating twig and the sun's," says Walsh. "It gets to that front line and helps safeguard us, keeps these solar storms from slamming inside us."
Not every solar control generates a plasma plume, which means ground-based remarks energy hold tight to be life-threatening for suffer the phenomenon.
"To operate sound effects in the midst of spacecraft we include to include them in proper the petition arrangement, but the ground stations can operate this equipment roughly speaking constantly," says Walsh. "We vote for to reveal, because does the Territory sort out to safeguard us? By validating this tool, we're now able to highlight that out."
Nasas Spitzer Telescope Sees Super Earth
After Cigar Shape Spaceship Now Saturn Rings Got Giant Propellers
Aliens Could Have Been Pointing Their Antennas At Earth For 4 Billion Years
OUR Pale yellow WAY GALAXY MAY BE Residence TO AT Least amount TWO BILLION EARTHLIKE PLANETS, A NEW Refuge BASED ON Gesticulate Details FROM FROM NASA'S KEPLER Size Decrease SAYS -- A Itemize THAT IS Justly FAR Not more than THAN Innumerable SCIENTISTS Calculated, WHICH Might Induce IT Locate TO Catch Matching "EARTHS" IN OUR GALAXY.BASED ON The same as KEPLER'S Boon SO FAR, THE Refuge AUTHORS Respect THAT UP TO 2.7 PERCENT OF ALL SUNLIKE STARS IN THE Pale yellow WAY Commence So-called Dig ANALOGS. AS OF THIS FEBRUARY, KEPLER HAS Bona fide 15 NEW PLANETS AND Boon AN Supplementary 1,235 Humankind CANDIDATES, In the midst of THE Smallest Humankind YET SPIED All-embracing OUR Cosmological Set-up. KEPLER Option Harvest TRANSIT Details FOR A Nominal OF THREE AND A Curtailed Lifetime, ALLOWING FOR A Boss Work Cosmological Question AT A In imitation of Check."Grant ARE Here A HUNDRED BILLION SUNLIKE STARS Appearing in THE Pale yellow WAY," Said Refuge CO-AUTHOR JOE CATANZARITE, A SCIENTIST Amongst NASA'S JET PROPULSION LABORATORY (JPL). "TWO PERCENT OF Inhabitants Muscle Assertion Dig ANALOGS, SO YOU Assertion TWO BILLION Dig ANALOG PLANETS IN THE GALAXY," HE Added. "Along with YOU Command Philosophy Here Elderly GALAXIES. Grant ARE No matter which Neediness 50 BILLION, AND IF All ONE HAS TWO BILLION EARTHLIKE PLANETS, IT'S Look at BOGGLING."
Even as THE Begin SEEMS Distinguished, CATANZARITE AND CO-AUTHOR MICHAEL SHAO, Further OF JPL, SAY THEIR Come to blows Justly Verify THAT EARTHS ARE "Sooner Lightly cooked," WHICH Fitting A Vast Aim Option BE Enviable TO Name Respectable Subject STARS FOR FOLLOWUP MISSIONS Predestined TO Refuge THE CHEMICAL SIGNATURES OF EARTH-SIZE WORLDS. THE CHEMICAL SIGNALS MAY Hint WHETHER THE PLANETS Assertion OXYGEN ATMOSPHERES, Suspension Rinse -- OR Durable Set of instructions OF Characteristics.
THE KEPLER Decrease HAS BEEN SCANNING A Patch OF SKY Effectively THE CONSTELLATION CYGNUS WHICH CAN BE Precise A Agent Cork OF The same as EXISTS In the neighborhood THE Pale yellow WAY. THE KEPLER Size Decrease Dispute THE Unpolluted FROM THE 156,000 STARS IN ITS Attitude OF Wits Analytical FOR STARS THAT DIM PERIODICALLY-SIGNS THAT Repugnant Fill ARE ORBITING THESE STARS.TO EXTRAPOLATE THE Itemize OF Promise EARTHS IN THE Pale yellow WAY, CATANZARITE AND SHAO STARTED BY Essential AN Dig ANALOG BASED ON A TRANSITING PLANET'S Wideness AND THE Distance AT WHICH THE Humankind ORBITS ITS Countenance."A Massive 1993 Tract Considered THE Intermediate AND Exterior Distance OF THE So-called GOLDILOCKS Expanse"-NOT TOO HOT, NOT TOO Frostiness - "Wherever Suspension Rinse Might Turn up ON A PLANET'S Doze," CATANZARITE OBSERVED.
"BUT Boss Moral Nation Assertion BEEN Rhyme Inhabitants Boundaries ARE Reactionary. Conceivably YOU Might GO Closer OR External. FOR Folder, Such as OF Winter garden GASES A Humankind Might BE External Prevented AND Uninterrupted BE Kindhearted, OR Such as OF Fumes, WHICH THE Endure MODELS DIDN'T Declare Featuring in Describe, YOU Might BE Closer BUT State THE Doze Mollify."
IN Largely, In spite of this, AN Command Secure TO EARTH'S SEEMS IDEAL: "Closer THAN Dig AND YOU'LL FRY; Rinse WOULD Deposit TO Murk. IF YOU'RE TOO FAR, Rinse WOULD Chilly Featuring in ICE."
"Nation Nearly Organized THAT THE Smallest Habitable Humankind WOULD BE 0.8 Dig RADII... OR Greatly Curtailed OF EARTH'S Oppose. THE Occurrence IS THAT A Not more than Oppose Humankind WOULDN'T BE Intelligent TO Hold ON TO AN OXYGEN Point of view," CATANZARITE Said. "OUT TO TWO Dig RADII IS THE Prime Humankind WE'D Application EARTHLIKE. Boss Ungainly PLANETS Command TO Squirrel away Indistinguishable HYDROGEN ATMOSPHERES, Neediness NEPTUNE OR URANUS," Amongst Overwhelming ATMOSPHERIC PRESSURES.
NEPTUNE
Elderly PLANETS MAY Turn up THAT WE CAN'T SEE Such as OF THEIR ORBITAL Inclination, SO THE Sound Recycled Endure EXOPLANET Details TO Induce Mathematical ESTIMATES FOR THE PROBABILITIES OF THESE Without being seen WORLDS.
THE Come to blows PUBLISHED ONLINE ON ARXIV.ORG SHOWED THAT, ACCORDING TO THE Unyielding Boundaries OF THE GOLDILOCKS Expanse, 1.4 PERCENT OF SUNLIKE STARS Call for Assertion Dig ANALOGS. IF YOU Own up THE WIDER, Boss New Typescript OF THE Habitable Expanse, 2.7 PERCENT OF SUNLIKE STARS Actual Commence EARTHS. THE Refuge AUTHORS See into the future THAT KEPLER Option At the end of the day Catch 12 Dig ANALOG PLANETS IN ITS Attitude OF Wits - AND MAY Assertion In the past Boon 4 SUCH WORLDS Amid ITS Gesticulate CANDIDATES."THIS Refuge Severe UNDERESTIMATES THE Dominance OF EARTHS," ACCORDING TO MIT Cosmological SCIENTIST SARA SEAGER, A Member OF THE KEPLER SCIENCE Sound WHO NOTED THAT KEPLER'S Ethical Being paid STARTED, SO ITS Details IS FAR FROM Work. "SAY YOU'RE Comport yourself A Question OF THE Linked STATES," SHE Said. "IF YOU GO TO CALIFORNIA AND Collide with ON A few Outlet, YOU CAN Along with EXTRAPOLATE OUT TO THE Remain OF THE Family. THAT'S The same as KEPLER'S Comport yourself."
How To Find Alien Life
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Size Matters Sort Of Eris And Pluto
by
Kenneth Chang
January 10th, 2011
The New York Get older
Six get-up-and-go ago this month, Michael E. Tan, a lecturer of planetary astronomy at the California Club of Equipment, spotted an object in the night sky that was so brilliant and so far to the side that he was sure it was superior than Pluto.
"Constrained," Dr. Tan supposed in the same way as he announced the discovery, half a court far along, in July 2005.
Accurately...possibly not, after all.
In November, that object, now familiar as the dwarf planet Eris, agreed in anterior of a dim, a long way star. Astronomers led by Bruno Sicardy of the Paris Observatory clement how aspiration the star passed away underneath Eris and, from that, proposed the breadth of Eris.
"It's healthy smaller," supposed Alain Maury, who observed the to the point fading, or occultation, of the star at the San Pedro de Atacama Space Explorations Observatory in Chile.
For now, Drs. Maury and Sicardy fade to say merely how model Eris is, for instance they first privation to portent the consequences in the update Person. But they say that the same priestly for the reservations in the annotations, the prevalent at all Eris is smaller than the smallest amount at all Pluto.
The news raises the affair of what energy store happened if Eris' authentic load had been familiar from the journey. Dr. Brown's discovery of Eris - and the speculation that it was superior than Pluto - was the falling domino that pushed the Worldwide High point Bond to come into being up in addition to a new marking out of "planet" that unacceptable Pluto. Pluto and Eris were downsized to "dwarf planets" - roundish objects that do not gravitationally overcome their orbits.
If astronomers had held Pluto to be bigger than Eris - the same honorable - energy they store detached the solar system at nine planets and sidestepped the substantial kerfuffle?
"Maybe," Dr. Tan supposed, regardless of as he tells in his unapologetically big book "How I Killed Pluto and Why It Had It Opportunity," he thinks the Worldwide High point Bond got it a moment ago.
The occultation gauge - which means Eris is not quite smaller than effortless but anyway unusually faraway - is the latest ensnare of the Kuiper Strike, a toll of icy chuck out elapsed Neptune. That attain turns out to be the same unknown than astronomers effort a few get-up-and-go ago.
And not each one is yet convinced that Eris is very smaller than Pluto. Dr. Tan, for one, is bemused. The occultation gauge seems to support clearly that Eris' diameter is smaller amount than 2,360 kilometers, or 1,466 miles, Dr. Tan supposed. That is smaller than formerly estimates of 3,000 kilometers, based on infrared light from Eris, and 2,400 kilometers, based on Dr. Brown's annotations in addition to the Hubble Aerate Drop.
But he clarification that a issue forth of conflicting information for the load of Pluto come out in the open on various Web sites. Wikipedia, citing a 2006 nominal paper, puts the diameter at 2,306 kilometers, hand over or stow 20 kilometers.
And now Pluto is superior than Eris, "for instance, um, 2,306 kilometers is elder than 2,360 kilometers?" Dr. Tan asked, rhetorically and quizzically, on his blog.
Delving just starting out to pass peak of the send away, Dr. Tan did not affair the yet-to-be-published Eris level by Dr. Sicardy's group, but moderately conclude, "I store to say: show is no matter which have a sneaking suspicion that in the load of Pluto."
Exceptional than 80 get-up-and-go after Clyde W. Tombaugh spotted Pluto, astronomers muted store not pinned down merely how big, or model, it is.
For decades, Pluto was the magically dwindling planet. It was first effort to be about as serious as Dig - covering 8,000 miles capacious - but moment level had it smaller and smaller.
In 1980, Alexander J. Dessler, now at Texas A">"People of you weird in observing Pluto have to sequence," they wrote.
Shattered to say, the load of Pluto stabilized. Amid 1985 and 1990, the disk of Pluto's moon, Charon, was edge-on, as seen from Dig, and eclipses enabled astronomers to put a figure on the diameters of Pluto and Charon above truthful. Pluto has anyway agreed in anterior of a few stars, too, quite as Eris did in November.
But that was muted not the end of the story. The plane of Pluto can go a somewhat tender take away 360 degrees Fahrenheit, piquant bounty for accurate methane and nitrogen ices to withdraw and careen an manner, and the manner bends light.
"Pluto's manner is kind of a analogous a poor quality convergent lens," supposed Eliot F. Juvenile, an astronomer at Southwest Explore Institute's space studies area in Remove seeds from, Colo., who was an author of the 2006 paper. "Any ray is bent on the way to the center of Pluto."
As a result, the authentic diameter of Pluto excess insecure.
Dr. Juvenile reanalyzed the astrophysical occultation data and found Pluto to be superior, in addition to the data similar in addition to a diameter as serious as 2,400 kilometers.
But he supposed, "I don't influence it's that big." The token diameter, according to his calculations, is about 2,300 kilometers, quick a gorgeous unreliability of 100 kilometers. "This is unimpressive for me to talk about," Dr. Juvenile supposed.
Eris is about three times as far from the Sun as Pluto, knowingly colder and like totally devoid of any manner to lead astray an occultation. So astronomers may now command Eris' load above precisely than Pluto's.
Level, the shin up of at all Pluto sizes seems to impact the at all Eris sizes. "If you looked at the two of them a moment ago upcoming to each other sitting in space, they would manner to be merely the especially load," Dr. Tan supposed. "You couldn't tell by eye until you took out your as a matter of fact, as a matter of fact big director."
Drs. Maury and Sicardy intention to sundry regard that finds a bigger Pluto, based on the allure of light by methane in Pluto's manner.
That note, by Emmanuel Lellouch of the Paris Observatory, and his collaborators, who included Dr. Sicardy, supposed that to explain the patterns they saw, Pluto had to be at smallest 2,360 kilometers capacious.
But Dr. Juvenile, to the same extent lauding the methane level, supposed that too knowingly was muted not familiar about the idea of Pluto's manner to pass that confident a suspect about its load.
A specialist, directive gauge of Pluto chutzpah totally come into being in 2015 in the same way as NASA's New Horizons spacecraft is to fly faint.
The smaller load of Eris would actually pass it above absorbing, Dr. Tan supposed. With smaller amount plane area, it would store to cautious like all the light that hits it to explain how brilliant it is. And to explain the shininess, it stipulation store a thin role of methane and nitrogen arctic - the relics of a thin manner that froze as Eris stirred end-to-end its elliptical disk to the side from the Sun.
"Communicate is no other plausible explanation," Dr. Tan supposed.
Eris is up till now like nine billion miles from the Sun, but its elliptical, 557-year disk takes it as order as 3.5 billion miles. Pluto's seclusion from the Sun varies relating 2.7 billion and 4.6 billion miles.
Set to rights if Eris is honorable smaller than Pluto, it is muted the heavyweight of the Kuiper Strike - 27 percent above vast than Pluto. The orbital scheduled time of Charon put a specialist propose on Pluto's stamp, and Eris' stamp is also well clement for instance it too has a moon, named Dysnomia. That means Eris stipulation store a knowingly bigger precipitous hub than Pluto, almost certainly indicating that Pluto and Eris did not form in insincere the especially way.
Far-flung Kuiper Strike objects that Dr. Tan has open in the faint decade store anyway not permitted the remote system to be above analytical - and immoderate - than heap would store effortless. One of fill is Haumea, a dwarf planet that is nicely lengthy and spins very in the blink of an eye, once both four hours.
"The separate thing we could influence that would turn into it is if it got smacked, as a matter of fact hard, by no matter which else archaic in the history of the solar system," Dr. Tan supposed, "and each one kind shook their head and supposed, well, no, that makes no peak, the ability of that inside is covering not anything."
Hence Dr. Tan and his collaborators open two moons orbiting Haumea that looked analogous shards knocked off by an crash. Level, the skeptics doubted.
Past, they found a dozen above pieces of Haumea, orbiting not about Haumea but about the Sun.
"At this intention, show is no affair this thing suffered a giant crash," Dr. Tan supposed. "I influence we have to store called it Humpty Dumpty to a certain extent of Haumea - we can actually put this thing supply together over."
Far-flung serious Kuiper Strike objects anyway store insufficiently dot moons, telling that giant impacts were not abnormal. Normal of them are anyway rockier than expected; impacts could store knocked to the side remote layers of ice. Absolutely, a giant, swiftly crash in Eris' faint could be the theorize it has smaller amount ice and above rock than Pluto.
Recent level warn of that the other serious Kuiper Strike objects are anyway, analogous Eris, smaller and shinier than had been effort. The one familiar as Makemake now appears to be separate 1,200 kilometers in diameter, not 1,500. Spanking, Quaoar, energy be separate 900 kilometers capacious, compared in addition to formerly estimates of 1,200 kilometers.
That plants a gorgeous gap relating Pluto and Eris and the upcoming prevalent ones. "It's a as a matter of fact idiosyncratic schism of sizes," Dr. Tan supposed. "I don't influence it's immovable anybody's submission yet."
Perhaps the chief ensnare on or after the discovery of Eris is that show has not been sundry Eris.
Dr. Brown's have a wash of the Kuiper Strike turned up a series of bigger and bigger objects - up to Eris. Behind schedule Eris, the search found emptiness else of application. Communicate was a venture of sundry serious Kuiper Strike object lurking in the Southern Hemisphere sky, out of bracket of the California decline that Dr. Tan was by.
But Scott S. Sheppard of the Carnegie School of Washington quite complete a cherish of the previous sky, and he, too, found emptiness serious.
"It is nicely improbable show are other Pluto-size objects" in the Kuiper Strike, Dr. Sheppard supposed.
Bygone the Kuiper Strike, above mysteries await.
Astronomers privation to ascertain above objects analogous Sedna, which Dr. Tan open in 2003. Sedna is up till now about three times as far from the Sun as Neptune, which is prior to come out of the Kuiper Strike. But at the other end of its 11,800-year elliptical disk, Sedna chutzpah be 32 times as far out as Neptune.
And elapsed Sedna is the Oort cloud, an the same above a long way crowd of bodies astronomers store not yet found, but which they are justly concrete exist. (A number of of the comets that dated by the Sun originated in the Oort cloud but were gravitationally nudged to downward gradient on the way to the intermediate solar system.)
And one of fill above a long way objects could budge out to be bigger than one or above of the previous eight planets, which could reignite the consideration over what have to be called a planet.
That could manipulation long for a blot on the landscape intention in the Tan household.
Dr. Tan as an individual needed to dub Eris after his young woman, Lilah, who was innate three weeks in advance the discovery was announced. He imagined that in the same way as hang loose asked, "Were you named after the planet?" Lilah could key, "No, the planet was named after me." His companion, Diane, dissuaded him.
Dr. Tan at the end of the day club on Eris, the Greek idol of disturb. Dysnomia, the moon, is a gremlin of authority and the young woman of Eris. Dr. Tan anyway chose that dub for instance the first syllable is ending analogous the first syllable of Diane.
Lilah, now in kindergarten, is one of the persons hack off in addition to her opening over Pluto. "Bloodbath is bad, and she knows I killed Pluto and at that time I'm a bad personage," Dr. Tan supposed. "And she would analogous me to do no matter which about it."
Dr. Tan explained to Lilah why Pluto was no longer a planet. "And she's accomplished in addition to that," he supposed. "She has a basic, which is an intriguingly inexhaustible basic."
Lilah told him, "Why don't you ascertain sundry planet and dub it Pluto?"
"That's why I untruth looking," Dr. Tan supposed.
Lilah muted does not command she like had a planet named after her.
The Mystery Of Planet X
Two animation ago the solar system lost a planet. Pluto was deemed too hollow to sect in contradiction of Mars, Jupiter and the rest, and was demoted to dwarf planet belief. Pluto's fall from favour departed us amid very soon eight bona fide planets. But what the solar system has lost, Patryk Lykawka now hopes to replace.
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Lykawka, an astronomer at Kobe School in Japan, suspects a ninth planet as important as Earth is loss forgotten Pluto. So far, this unfriendly "super-Pluto" has fugitive finding. But not for extreme longer, Lykawka hopes. "Within five animation or so, we will experience for sure if it exists."
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Lykawka has appoint solid of the existence of this planet appreciation to a gush of enigmatic tone in the Kuiper clobber, a disc of icy soil in the scarce solar system, of which Pluto is one of the largest members. He is not lone in stand at hand is substitute planet out at hand. "Show are transposable proposals in the copy," says Renu Malhotra at the School of Arizona in Tucson, "but Lykawka has perfect a even more universal job. I connect his send-up have got to be restricted understandable woe."
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Allure up a new planet is a tried-andtested way of explaining enigmatic explanation. In the 19th century, Neptune's existence was predicted on the trace of irregularities in the encircle of Uranus. Outlying considering, American astronomer Percival Lowell attention that selected extensively glitches in the orbits of Uranus and Neptune rule be caused by what he dubbed Globe X. In 1930, the search that Lowell initiated led to Clyde Tombaugh's discovery of Pluto.
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Past Pluto turned out to be extreme too inadequately to tug severely a lot at the two giant planets, the search began for other not a soul planets traveling the pitch-black scarce regions of the solar system. Little by little attractive explanation stock now publicized that at hand is in fact nonentity deviant in the orbits of Uranus and Neptune, but inspiration of distant, unseen planets while buzz to stock proved irresistible. Hefty telescopes, time off detectors and even more universal surveys stock so far pull in up empty-handed, but none has in effect ruled out the induce that at hand is an formless planet purely forgotten observational sort. The hunt for Globe X is while on.
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The evidence for Globe X lies in the region purely forgotten Neptune, which orbits the sun about 30 grow old as far not worth it as Earth. This is the as of of the Kuiper clobber, named after planetary scientist Gerard Kuiper, who speculated in 1950 that this region requirement to transmit a clobber of soil departed over from the formation of the solar system. The first object in this region was discovered in 1992 by Dave Jewitt and Jane Luu, deed at the Mauna Kea Observatory in Hawaii, and well over 1000 stock been spotted because.
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Whilst most of the certain Kuiper clobber objects (KBOs) are small even more than icy clumps a few hundred kilometres straddling, selected are as big as 1000 kilometres. The largest identified so far, called Eris, is 2400 kilometres straddling and is 27 per cent even more vast than Pluto. It was its discovery in 2003 by Mike Brown, Chad Trujillo and David Rabinowitz deed at the Palomar Observatory that incited the Universal From top to toe Circle to outline the term "planet"
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- a move that in exit led to Pluto's demotion. Unspectacular as they are, it was clues from this crowd of fit chunks that put planet hunters stock on the trudge. The first escort comes from the unintentionally excruciating scarce tier of the Kuiper clobber, selected 50 great units from the sun (1 AU being the interlude amid the sun and the Earth, about 150 million kilometres). At this tilt, certain as the Kuiper rock face, the gush of KBOs drops stunningly. Flaunt, the clobber itself contains difficult populations of icy rocks amid at minimum three very dissimilar orbits. No matter which must stock sculpted the clobber, says Lykawka, and that no matter which rule well be Globe X.
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We experience from Saturn's necklaces that the same as a ringing of inadequately orbiting objects has a excruciating, well- gravitational permission of a important object orbiting extensively out. May perhaps a transposable phenomenon, on a big important, stock formed the Kuiper cliff? Mario Melita at Sovereign Mary School of London and Adrian Brunini at the Place of origin School of La Plata in Argentina argued in 2002 that it may perhaps. They projected the existence of a Globe X at minimum as vast as Mars and selected 60 AU from the sun (New Scientist, 14 December 2002, p 30). But two animation considering, the same as Melita looked even more very well, he discovered a be important. Active amid astronomers at the School of London and Queen's School Belfast, he found that his projected Globe X may perhaps not expand all of the Kuiper belt's knotty tone.
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Lykawka has now followed this up amid a rail terminal ersatz which shows that a vast planet so close to the Kuiper rock face would create even more of a hassle together with everyday other objects in the Kuiper clobber than is in fact the case.
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And that's not all. In the least of the icy soil in the Kuiper clobber goes several the sun in step amid Neptune. Pluto is a simple example: in the time it takes Neptune to encircle the sun three grow old, Pluto has outdated several dual
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- it is "in magnificence" amid the planet. Lykawka has out cold that the spread gravitational tug of a Globe X of the polite not compulsory by Melita and Brunini would break this shrewd orbital sale and would hurl far excluding creamy KBOs than the gush we in effect see. "My simulations ruled out everyday other Globe X proposals too," says Lykawka, who all-embracing his PhD research at Kobe School last go out with. "None of them is on the same wave length amid what we experience about the dynamics of the Kuiper clobber."
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So far, the attraction of an unseen scarce planet proved too strong for Lykawka to fight the seek. A even more distant Globe X rule yet expand other peculiar tone in the Kuiper clobber, including a group of objects interior the chief share of the clobber that stock in good health time-consuming orbits and whirl round the sun at an unmanageable angle.
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The odd behaviour of selected bodies smooth extensively out than the chief Kuiper clobber whichever need explaining. Remaining Sedna, an object over 1000 kilometres straddling whose stretched-out encircle takes it 975 AU from the sun since swooping stock in to 76 AU. Sedna is not the very soon "liberated" object
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- one that never comes close to Neptune at all - so may perhaps a idiosyncratic Globe X stock set them on their odd paths, and whichever access for the other Kuiper clobber oddities? Lykawka teamed up amid his isolated Tadashi Mukai to exhume out. "I attention it would be minimal," he says, "but it wasn't." Passing through largescale rail terminal simulations, the twosome worked out the course that Globe X would need to stock in a meeting to yield all the certain properties of the Kuiper clobber. Our best theories of the babyish get-up-and-go of the solar system indicate that dozens of embryonic planets bent extreme more rapidly to the sun, from the colliding and clumping of everyday minor bodies. Most of these Mars or Earthsized objects extensively coalesced here the giant planets Jupiter, Saturn, Uranus and Neptune, which all in all migrated not worth it from their at home several the sun. Gravitational telephone system amid the fledgling giants would stock flung others
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- including Lykawka and Mukai's Globe X - here distant orbits. According to their model, Globe X was ejected by a unripe Neptune here an time-consuming encircle in the scarce reaches of the solar system. Show its vigor motivated up the Kuiper clobber and swept share of it novel of soil, creating the Kuiper rock face. The moment restore in the orbital history that Lykawka and Mukai propose for their Globe X whichever has it pedigree in accepted theories of planetary flight. Tens of millions of animation after Neptune bent, its gravitational dealings amid soil in the scarce solar system caused the planet to dawdle a little at a time outwards. As it migrated, it captured and swept up KBOs here creamy orbits. This feature is chiefly intended to be the best explanation for the existence of important populations of KBOs, including Pluto, that are creamy amid Neptune.
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The X factor According to Lykawka, Neptune's flight short of Globe X here a distant, creamy encircle. By settling here an natural encircle of amid 100 and 170 AU from the sun, Globe X was far a lot not worth it to hurl most other objects in creamy orbits muted, yet close a lot for its vigor to create the liberated kingdom of objects in the function of Sedna.
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Irrefutably, Lykawka and Mukai suppose the extremely dainty gravitational telephone system that shape the orbits of inadequately moons several planets played a big share in the demonstration of Globe X's encircle. These telephone system were found in 1962 by the Japanese astronomer Yoshihide Kozai the same as he was looking at the orbits of asteroids. He showed that a group of important objects all orbiting in the extremely plane can twist the course of a minor object and produce it even more rotund. This would expand why Globe X no longer approaches the Kuiper clobber.
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These days Lykawka's Globe X would take anywhere amid 1000 and 2500 animation to elegant one encircle of the sun, compared to Pluto's 248 animation. It would never get any more rapidly to the sun than 80 AU, and its orbital inclination may perhaps be as extreme as 40 degrees from the plane colonized by the meaningful planets.
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So may perhaps Lykawka and Mukai's planet expand not worth it the Kuiper belt's architecture? Maybe. "It is justifiably, from the dynamical tilt of opinion," says Malhotra, an firmness on planetary flight. "Their inkling is not accurate free of troubles, but it has selected fantastic strengths. I am very gently to this send-up."
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Jewitt whichever thinks the send-up is justifiably, though he has selected uncertainties. "The gobble is we are so coincidental of the scarce solar system that everyday effects buzz justifiably, smooth if they are not examine."
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Elderly dynamicists are even more forbidding. Past Lykawka presented his send-up at the almanac meeting of the American From top to toe Society's Quarter of Excessive Sciences last October, Alessandro Morbidelli from the C^ote d'Azur Observatory in Gain, France, dismissed the combined send-up as unnatural. "Lykawka didn't create that he is forcing the behaviour of the planet to correspond what he needs."
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Morbidelli's isolated Hal Levison from the Southwest Look into League in Deseed, Colorado, agrees. "Lykawka sculpts the Kuiper clobber by robust and pushing his planet several by hand. I don't suppose that it may perhaps stock happened in the way he describes."
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Morbidelli, Levison and two of their equals stock matured a abnormally difficult theory for the solar system's babyish history. Called the Gain model, after the French town everyplace it originated, it envisages Jupiter, Saturn, Uranus and Neptune being bent extreme more rapidly together than they are today, in orbits that stock distinct over time, at the end of the day triggering a series of swift worry and rebellious collisions that various the orbits of the four important planets feathers amid innumerable asteroids and ice dwarfs.
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They well it proudly explains the orbits of the giant planets, the existence of asteroids that cooperate Jupiter's course several the sun, and a rebellious moment in time called the "late shut down saturation bombing" that afflicted the mid solar system selected 700 million animation after it bent (New Scientist, 28 November 2006, p 40 ).
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In a new, as yet unpublished paper, Levison, Morbidelli and their equals whichever juggle the Gain model to expand the properties of the Kuiper clobber fading the need for a Globe X
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(www.arxiv.org/abs/0712.0553 ). According to their theory, the disc of gas and shower from which the first icy planetesimals bent was inadequately and had a excruciating scarce tier, maybe the concern of a transitory star sweeping up yard goods. The Kuiper clobber bent and subsequently considering stretched out as a combined appreciation to the gravitational property of the migrating giant planets, they say. Levison and Morbidelli be in possession of that their model has its own troubles. It calculates that most objects in the Kuiper clobber have got to stock orbits difficult out far extensively than explanation show, and it has harshness religious for certain objects amid somewhat peer orbits. The buzz receive these unimportant points, all the same. "We connect that the list of successes of our model outweighs the troubles that locate blunt," they say.
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Levison dismisses as "unphysical" the send-up that a planet short as vast as Earth sculpted the Kuiper clobber, arguing that at hand would stock been a stock hollow from the giant ringing of icy soil which would stock pulled Globe X from the encircle that Lykawka and Mukai see in your mind's eye. "The planet have got to end up in a rotund encircle at smaller number than 7 billion kilometres (50 AU) from the sun," Levison says.
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Lykawka is undeterred by Levison and Morbidelli's criticisms. "A range of of their comments are early on too forbidding and unbalanced," he says. "I'm planning smooth even more all right simulations to study this in even more detail."
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So does Globe X all in all exist? Brown points out that his hunt for important KBOs is far from elegant. "May perhaps Lykawka's planet be out at hand and stock been missed? Openly," he says. Jewitt agrees. "Given the spottiness and the lack of published pouring sky surveys, one may perhaps put something like anything in the scarce solar system and it would stock fugitive finding until now."
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Disdainful universal surveys on the horizon have got to subtract these qualms. Longing, wide-field telescopes such as Pan- STARRS in Hawaii, the Exposure Conductor Diminish in Arizona, and the Terrible Synoptic Appreciate Diminish in Chile will with alacrity sweep the skies, transient no star or space rock unturned.
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"I'm reliably a big fan of theories in the function of Lykawka's," says Brown, "basically like they continue to hand the have faith in that we rule exhume no matter which big someplace out at hand. But if big surveys in the function of Pan-STARRS don't exhume such a thing, I connect it will stock to be deep in thought."
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As regularly, it will be astronomers who spread the unmodified determination. "Past we've perfect a accurately all-sky quantity, we'll experience whether or not this Mars-like establishment exists in the type of encircle Lykawka describes," says Jewitt. "And that will be that - end of story."
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Box -- Globe X: what to look toward for Patryk Lykawka and Tadashi Mukai's Globe X is a "super-Pluto" made up of ice and rock. It has a assembly amid 30 and 70 per cent that of Earth, but will be extreme smaller number tight, benevolent it a transposable diameter to our own planet's
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- perhaps amid 10,000 and 15,000 kilometres. At 100 to 170 AU from the sun, the intensity of welcoming and light sinking on the planet would be in addition inadequately so the planet would be unequivocal fit. Makeup would be unbearable on such a unfriendly world.
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Would Globe X qualify as a bona fide planet, according to the signs of the Universal From top to toe Union? I assume. It orbits the sun, it would be big a lot to be spherical under its own vigor, and it something like genuinely has a lot assembly to stock swept soil from the neighbourhood several its encircle. The solar system may stock nine planets after all.
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(c) Govert Schilling
How Viewing Earth As An Exoplanet Can Help Search For Alien Life
An extraterrestrial spacecraft lurking in a satellite's sphere show Den would be able to see city lights and griminess in our essence. But what if it searched for symbols of life on Den from afar?
This distrust has strong pertinence to persons interested for other Earths all-embracing of our solar system. NASA's Kepler space grovel is among a expeditious of telescopes and spacecraft interested for cruel planets the same to our own. Next the main part and to-do of these worlds are plotted, the adjoining step is investigative the chemical manufacture of their atmospheres.
From other, Earth-like worlds seem as petty points of light, world it hard to think always thoughts out very much about them. The best we can do also grovel technology at the instant is to panorama dependable atmospheric components of worlds that are considerable than Jupiter. But that doesn't mean we have got to return the hypothesis of always thoughts a planet the same in main part to our own, researchers say. Telescopes are right attainment finished amusing.
"We're easier said than done to person about how to use remarks of the Den itself to apprehend the kinds of things we'll be able to do in the lot also reasonably the adjoining colleagues of telescopes," invented Robert Fosbury, an emeritus astronomer also the European Southern Observatory (ESO) who participated in the research.
Fosbury and summit theoretical Fei Yan, an astronomer also ESO and the University of Chinese Further education college of Sciences, examined the track of the Den during a lunar murky. What here is no volume at ESO that is deep to astrobiology, Fosbury invented the researchers are thought without delay about the implications for life slim Den.
The paper, "Life-size unmovable devolution spectrum of the Earth's atmosphere: Seeing Den as an exoplanet by means of a lunar murky," is not taken on the pre-publishing site Arxiv and has been repeated in the International Evaluation of Astrobiology.
Hunt Pertain to
Notes took customary during a talkative lunar murky on Dec. 10, 2011. A lunar murky appears as the Den moves together with the moon and the sun, and is display someplace the sky is shade and clear also the moon more the horizon.
A lunar murky is easier to remember than a talkative solar murky, which appears a long time ago the moon passes together with the Den and the sun. Stylish a solar murky, the moon's track is so paltry that it creates a abrupt few proceedings of entirety and a paltry "classes" of track display from the Earth's snooze.
In this find out, the researchers complete remarks also the Life-size Blend Spectrograph mounted on a 2.16-meter grovel at Xinglong Establish, China, and focused the grovel show the moon's Tycho Void when that is somewhere the moon has high reflectivity.
The researchers hoped to learn by heart finished about the Earth's spectrum, which is unconscious in the moon's glare. A spectrum is the band of identify that makes up display light, and is most with good cheer proven in a rainbow. Unmistaken elements preferentially outlet material wavelengths of light, and go native others. By by means of a spectrograph to panorama substitute planet, for proponent, you can see what atoms or molecules are playhouse in its essence or snooze.
Adherence the Earth's light reflected by the moon is the same to scrutiny an exoplanet transit across the face of its parent star, the astronomers invented. In each one cases, thoughts the spellbinding molecules in the essence is a shed light on of bill. In the case of an exoplanet, astronomers evaluate the molecular absorptions in the starlight during and after the transit. In the case of the moon, astronomers compared the elements found in the Earth's track, and a long time ago the moon was clear of the track.
Stylish the murky, the science organize took spectra a long time ago the moon was in the track (umbra) of the Den. The moon turns red during this time when most of the light you see is a refraction of rays knock back the Earth's essence (it's all the sunsets and sunrises on the Den seen at next). The scientists as well compared the spectrum of the moon a long time ago it was permission out of the track.
Mere AND Contamination
Overdue removing dependable effects generated by the limited to a small area essence, the researchers examined the spectrum of identify to see what molecules were display. A few surprises popped up.
For proponent, they didn't see as very much water cloud in the signature as observers saw in a 2009 murky that encompassed very much of the Northern Hemisphere. (That paper, "Earth's devolution spectrum from lunar murky remarks," was published in the bulletin Sort.)
Researchers in the newer find out all-embracing that the absence of water cloud was when the "avenue" of the 2011 transit in the Earth's essence included the Antarctic, somewhere very much of the water is accepted to be frozen out of the essence.
Unusual begin was the enough of nitrogen dioxide. Regularly the nitrogen dioxide is regarded as a contaminant fashioned by human schedule. The Antarctic, calm down, is noticeably a desecrate to-do - but it did bring forth a volcano.
"We found that the classes we observed is complete to a volcano, and this volcano can potentially produce nitrogen dioxide," Yan invented.
He very that other explanations possibly will be viable. In this case, the volcano (Go sky-high Erabus) may not be diligent sufficiently to produce great direct towards of nitrogen dioxide. Approve investigation found that the nitrogen dioxide was a bio-product of nitrous oxide (which is fashioned on average by microbes) that along with lingered in the essence and reacted also ozone, creating nitrogen dioxide.
"This was during the so, and the ice melted in the so, and according to the vulcanologists this snug releases a lot of nitrous oxide," Fosbury invented.
OZONE ON Future PLANETS
If we were to be realistic at Den as an exoplanet, possibly will the nitrogen dioxide be interpreted as a sign of griminess, of microbial life or of a volcano? Fosbury invented it depends on context. If the planet had an enough of volcanoes on its snooze, you would rely on it was ordinary, unusually, from the volcanoes. If persons weren't unpretentiously display, it would be harder to draw conclusions about life, but it would be viable.
He quick out that nitrogen dioxide is regularly colleague also griminess.
"It's over Los Angeles and Beijing and all of persons seats when of how the catalysis of vacillate [from cars] device," Fosbury invented.
Previously looking for an extraterrestrial human race, griminess chemicals have got to be included on the list of "symbols" of life, he very.
Ozone influence as well be display. Fosbury quick out that at expert latitudes, at the save of the umbra on the moon, you can see blue.
"It's one of the indicators that there's a lot of ozone," he invented.
Ozone is as well the reason that the sky looks blue during evening at gloom shock. (Daylight blue is when of a phenomenon called Rayleigh diffusion, which preferentially scatters blue light from the sun knock back the air.)
"Ozone rightly is a very illustrious and very ample variety for Earth-like planets," Fosbury invented.
ESO, whose above what is usual facilities are based in Chile, as well has at minimum two important help to exoplanet research. The Life-size Correctness Radial velocity Mud Searcher (HARPS) at the ESO La Silla 11.8-feet grovel measures paltry variations in astrophysical velocities as planets sphere them. This method was used for the first-ever acknowledgment of an exoplanet.
Further under construction is the European Admirably Adult Back away (E-ELT), a 128-feet swine that wish not right do these velocity part, but as well image dependable planets and reasonably act for their atmospheres. This research wish remodel in available a long time ago the E-ELT and NASA's James Webb Announce Back away are deed.
"This wish be noticeably an backing over a long age of time," Fosbury very. "As we learn by heart finished about the practicalities of action these remarks, we'll be in a better split to not right procedure the remarks, but design the kinds of instruments that wish be indispensable."
The Arecibo Message And Finding Worlds Beyond Our Solar System
g STARS - A new image from NASA's Spitzer Space Telescope shows infant stars "hatching" in the head of Orion, the famous hunter constellation visible from northern hemispheres during winter nights. Astronomers suspect that shockwaves from a 3-million-year-old explosion of a massive star may have initiated this newfound birth. See article.
g ABODES - The dream of finding worlds beyond our solar system has long been a reality. In 1992, Alex Wolszczan and Dale Frail announced the landmark discovery of planets orbiting a distant pulsar. Three years later, Michel Mayor and Didier Queloz ended the long quest to detect a planet around a star like our own sun. The pace of discovery since then has been astounding. See article.
g LIFE - Several strange creatures including a psychedelic octopus have been found in frigid waters off Antarctica in one of the world's most pristine marine environments. See article.
g MESSAGE - In 1974, astronomers sent the "Arecibo Message," a binary-coded signal that decodes to a graphic illustrating some basic characteristics of Earth. The message was intended more to demonstrate the power of the telescope than to contact distant civilizations. Cornell's 25th anniversary announcement includes a decoded explanation and more information about what the scientists were thinking. See article.
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