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4/25/07 6:20 AM
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latinthunder
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Edited: 25-Apr-07
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For the first time astronomers have discovered a planet outside our solar system that is potentially habitable, with Earth-like temperatures, a find researchers described Tuesday as a big step in the search for "life in the universe." The planet is just the right size, might have water in liquid form, and in galactic terms is relatively nearby at 120 trillion miles away. But the star it closely orbits, known as a "red dwarf," is much smaller, dimmer and cooler than our sun. There's still a lot that is unknown about the new planet, which could be deemed inhospitable to life once more is known about it. And it's worth noting that scientists' requirements for habitability count Mars in that category: a size relatively similar to Earth's with temperatures that would permit liquid water. However, this is the first outside our solar system that meets those standards. "It's a significant step on the way to finding possible life in the universe," said University of Geneva astronomer Michel Mayor, one of 11 European scientists on the team that found the planet. "It's a nice discovery. We still have a lot of questions." The results of the discovery have not been published but have been submitted to the journal Astronomy and Astrophysics. Alan Boss, who works at the Carnegie Institution of Washington where a U.S. team of astronomers competed in the hunt for an Earth-like planet, called it "a major milestone in this business." The planet was discovered by the European Southern Observatory's telescope in La Silla, Chile, which has a special instrument that splits light to find wobbles in different wave lengths. Those wobbles can reveal the existence of other worlds. What they revealed is a planet circling the red dwarf star, Gliese 581. Red dwarfs are low-energy, tiny stars that give off dim red light and last longer than stars like our sun. Until a few years ago, astronomers didn't consider these stars as possible hosts of planets that might sustain life. The discovery of the new planet, named 581 c, is sure to fuel studies of planets circling similar dim stars. About 80 percent of the stars near Earth are red dwarfs. The new planet is about five times heavier than Earth. Its discoverers aren't certain if it is rocky like Earth or if its a frozen ice ball with liquid water on the surface. If it is rocky like Earth, which is what the prevailing theory proposes, it has a diameter about 1 1/2 times bigger than our planet. If it is an iceball, as Mayor suggests, it would be even bigger. Based on theory, 581 c should have an atmosphere, but what's in that atmosphere is still a mystery and if it's too thick that could make the planet's surface temperature too hot, Mayor said. However, the research team believes the average temperature to be somewhere between 32 and 104 degrees and that set off celebrations among astronomers. Until now, all 220 planets astronomers have found outside our solar system have had the "Goldilocks problem." They've been too hot, too cold or just plain too big and gaseous, like uninhabitable Jupiter. The new planet seems just right -- or at least that's what scientists think. "This could be very important," said NASA astrobiology expert Chris McKay, who was not part of the discovery team. "It doesn't mean there is life, but it means it's an Earth-like planet in terms of potential habitability." Eventually astronomers will rack up discoveries of dozens, maybe even hundreds of planets considered habitable, the astronomers said. But this one -- simply called "c" by its discoverers when they talk among themselves -- will go down in cosmic history as No. 1. Besides having the right temperature, the new planet is probably full of liquid water, hypothesizes Stephane Udry, the discovery team's lead author and another Geneva astronomer. But that is based on theory about how planets form, not on any evidence, he said. "Liquid water is critical to life as we know it," co-author Xavier Delfosse of Grenoble University in France, said in a statement. "Because of its temperature and relative proximity, this planet will most probably be a very important target of the future space missions dedicated to the search for extraterrestrial life. On the treasure map of the Universe, one would be tempted to mark this planet with an X." Other astronomers cautioned it's too early to tell whether there is water. "You need more work to say it's got water or it doesn't have water," said retired NASA astronomer Steve Maran, press officer for the American Astronomical Society. "You wouldn't send a crew there assuming that when you get there, they'll have enough water to get back." The new planet's star system is a mere 20.5 light years away, making Gliese 581 one of the 100 closest stars to Earth. It's so dim, you can't see it without a telescope, but it's somewhere in the constellation Libra, which is low in the southeastern sky during the midevening in the Northern Hemisphere. "I expect there will be planets like Earth, but whether they have life is another question," said renowned astrophysicist Stephen Hawking in an interview with The Associated Press in Orlando. "We haven't been visited by little green men yet." Before you book your extrastellar flight to 581 c, a few caveats about how alien that world probably is: Anyone sitting on the planet would get heavier quickly, and birthdays would add up fast since it orbits its star every 13 days. Gravity is 1.6 times as strong as Earth's so a 150-pound person would feel like 240 pounds. But oh, the view. The planet is 14 times closer to the star it orbits. Udry figures the red dwarf star would hang in the sky at a size 20 times larger than our moon. And it's likely, but still not known, that the planet doesn't rotate, so one side would always be sunlit and the other dark. Distance is another problem. "We don't know how to get to those places in a human lifetime," Maran said. Two teams of astronomers, one in Europe and one in the United States, have been racing to be the first to find a planet like 581 c outside the solar system. The European team looked at 100 different stars using a tool called HARPS (High Accuracy Radial Velocity for Planetary Searcher) to find this one planet, said Xavier Bonfils of the Lisbon Observatory, one of the co-discoverers. Much of the effort to find Earth-like planets has focused on stars like our sun with the challenge being to find a planet the right distance from the star it orbits. About 90 percent of the time, the European telescope focused its search more on sun-like stars, Udry said. A few weeks before the European discovery earlier this month, a scientific paper in the journal Astrobiology theorized a few days that red dwarf stars were good candidates. "Now we have the possibility to find many more," Bonfils said. http://news.yahoo.com/s/ap/20070425/ap_on_sc/habitable_planet
4/25/07 6:56 AM
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mallet
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Edited: 25-Apr-07
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Awesome
4/25/07 8:00 AM
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fob_77
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Edited: 25-Apr-07
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cool
4/25/07 8:16 AM
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JROB
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Edited: 25-Apr-07
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Only 120 trillon miles away! Hell thats right around the corner........
4/25/07 8:19 AM
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Chocolate Shatner
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Edited: 25-Apr-07
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These are the voyages of the starship OGPrise....
4/25/07 8:48 AM
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mallet
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Edited: 25-Apr-07
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^lol
4/25/07 9:08 AM
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MachetePhil
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Edited: 25-Apr-07
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so 120 trillion miles.

hmm....

how long would it take light to travel that far?

It was in the story somewhere, 20 light years or so. 

4/25/07 9:24 AM
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MrFixit
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Edited: 25-Apr-07
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*packs bags*
4/25/07 9:24 AM
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FastAndBulbous
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Edited: 25-Apr-07
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"it orbits its star every 13 days."

Good luck growing crops when summer only lasts 3 days.


"And it's likely, but still not known, that the planet doesn't rotate, so one side would always be sunlit and the other dark."

Paradise!


""We don't know how to get to those places in a human lifetime," Maran said."

If we do invent travel near the speed of light, it would still take 20 years to get there. Imagine volunteering to be on the first mission, giving up 20 years of your life just to get there, and when you arrive there's already some astronauts living there. "Hey, we invented a faster ship after you had been gone 10 years, it only took us a year to get here."
4/25/07 9:35 AM
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kungfugrip
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Edited: 25-Apr-07
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Why do they think the planet has to be just like the earth to have life on it? I doubt another planet evolved the same way as we did.
4/25/07 9:44 AM
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Dirt McGirrt
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Edited: 25-Apr-07
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Kungfu, 3 posts a year? How do you pull that off? Anyway... The life on the planet is of course 'the predator' and has visited our planet many times. You don't wanna visit there now, that alien that busted outta the dead predator from AVP is wreaking havoc. "Hey, we invented a faster ship after you had been gone 10 years, it only took us a year to get here." - lol
4/25/07 5:32 PM
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dragoon
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Edited: 25-Apr-07
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"If we do invent travel near the speed of light, it would still take 20 years to get there. Imagine volunteering to be on the first mission, giving up 20 years of your life just to get there, and when you arrive there's already some astronauts living there. "Hey, we invented a faster ship after you had been gone 10 years, it only took us a year to get here." haha
4/25/07 5:44 PM
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SirPrize
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Edited: 25-Apr-07
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"might have water in liquid form" "But that is based on theory about how planets form, not on any evidence, he said." "Based on theory, 581 c should have an atmosphere" It sounds like this is all just theory and speculation. Do any of you know what theories the scientists are using? In layman's terms?
4/25/07 6:36 PM
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Jack Carter
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"And it's likely, but still not known, that the planet doesn't rotate, so one side would always be sunlit and the other dark." Awesome! Both sides of the earth will have drastically different life forms. I imagine them constantly battling where the light meets the darkness. They probably have religions that depict the other side of the planet as "hell". I hope Riddick is in the middle of the battles somehow.
4/25/07 6:50 PM
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Entreri
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Edited: 25-Apr-07 06:55 PM
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Like I keep saying, the universe is full of life, and some beings that are less intelligent then us, a few that are wayyy more intelligent than the human race. The freaks may already have come to earth. It is only human ego (and silly religious reasons) that keeps most people from accepting the truth. 120 trillion miles. LOL. Our science and tech is pretty pathetic, probably there is intelligent life much closer than that, we just can't find it yet.
4/25/07 6:51 PM
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Jack Carter
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a few that are wayyy more intelligent than the human race Just three of them?
4/25/07 7:13 PM
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Entreri
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Edited: 25-Apr-07
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^ :-) Pulling a number out of my arse, probably less than 1% of intelligent life in the universe is smarter than us. But that could be due to my human bias... Anyway, otherwise we would have great many visitations. Distances aside (which would be overcome by vast intelligence, faster than light travel or some similar gizmo).
4/25/07 7:24 PM
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HELWIG
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Edited: 25-Apr-07
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"Imagine volunteering to be on the first mission, giving up 20 years of your life just to get there, and when you arrive there's already some astronauts living there. "Hey, we invented a faster ship after you had been gone 10 years, it only took us a year to get here.""

Wouldnt you notice them hauling ass past you along the way?
4/25/07 7:52 PM
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FastAndBulbous
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Edited: 25-Apr-07
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Probably not, if they're going faster than light.

But there could be advantages, since time slows and you wouldn't age 20 years during the 20-year trip. You would get to skip ahead a few years and enjoy technology that would have been invented after you were dead.
4/25/07 7:59 PM
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¤Unique¤
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Edited: 25-Apr-07
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*moves there* bye bye earth
4/25/07 8:15 PM
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karasu
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Edited: 25-Apr-07
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the real question: is there a local population of hot-wimmins with no men? If so, prepares to give up 20 years of life!
4/25/07 10:14 PM
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Chocolate Shatner
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Edited: 25-Apr-07
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Jack Carter is correct. Riddick better fucking be there
4/25/07 10:32 PM
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psychoslasher
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Edited: 25-Apr-07
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Watch everyone be all happy to move to this new planet and come to find out every year or so; a giant space worm lands on the planet to eat everything in sight only to find out that he really likes the taste of human flesh.
4/26/07 9:19 AM
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Dirt McGirrt
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Edited: 26-Apr-07
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Travelling this distance will never happen. Obviously there'd never be enough fuel no matter how it's carried on the ship. Also travelling at 1 / 37000th the speed of light isn't quite gonna cut it. 37k years per light year of travel. Current shuttle goes 18,000 mph. Speed of light is 670,616,629 mph. So traveling by space shuttle to the giant space worm planet would take about 760,000 years Plus I doubt there are any shuttle Gas'n'Go's on the way there either.
4/26/07 9:38 AM
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Stronghold
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Edited: 26-Apr-07
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Besides, the Romulans claimed that planet 100 bleems ago.

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