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Old 01-06-2007, 01:57 AM   #1
Pa33anger

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Default Scientists find most Earth-like planet yet
suprised nobody's posted this yet:
Quote, originally posted by CNN »WASHINGTON (AP) -- European astronomers have found the most Earth-like planet outside our solar system, and here's what it might be like to live there:
The "sun" wouldn't burn brightly. It would hang close, large and red in the sky, glowing faintly like a charcoal ember. And it probably would never set if you lived on the sunny side of the planet.
You could have a birthday party every 13 days because that's how fast this new planet circles its sun-like star. But watch the cake -- you'd weigh a whole lot more than you do on Earth. (Learn more about exoplanets)
You might be able to keep your current wardrobe. The temperature in this alien setting will likely be a lot like Earth's -- not too hot, not too cold.
And that "just right" temperature is one key reason astronomers think this planet could conceivably house life outside our solar system. It's also as close to Earth-sized as telescopes have ever spotted. Both elements make it the first potentially habitable planet besides Earth or Mars.
Astronomers who announced the discovery of the new planet Tuesday say this puts them closer to answering the cosmic question: Are we alone?
"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 new body. "It's a nice discovery. We still have a lot of questions."
There's still a lot that is unknown about the new planet, which could be deemed inhospitable to life once more is learned about it. But as galaxies go, it's practically a neighbor. At only 120 trillion miles away, the red dwarf star that this planet circles is one of the 100 closest to Earth.
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 wavelengths. 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, and gravity there would be 1.6 times as strong as Earth's. 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 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 mid-evening in the Northern Hemisphere.
Even so, Maran noted, "We don't know how to get to those places in a human lifetime."
But, oh, the view, if you could. 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.
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://www.cnn.com/2007/TECH/s....html
personally i find this very exciting...i think space exploration and colonization is essential to the survival of the human race; we can't depend on this one planet to shelter us anymore IMO, we've got to get out there and, i dunno, build space stations in the asteroid belt and settlements on mars...eventually aiming for interstellar exploration.
btw, there was this project back in the 60s called orion (not to be confused with the tarted-up apollo capsule they're working on now) that would have been simply but very effectively propelled by hydrogen bombs: http://en.wikipedia.org/wiki/P...on%29
what do you guys think of it? personally, i think it was a huge missed opportunity on the part of the US government, even if entire ships were constructed in space to avoid radiation in the atmosphere it would have been alot better than the chemical rockets everyone's using now...
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Old 01-06-2007, 02:21 AM   #2
elossenen

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If we can develop something that can travel at the equivalent of the speed of light, we're bound to get results real quick (20-30 years). If a regular NASA space shuttle, which travels at a speed of 20,000km/h, it would take around 680 years to reach it.
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Old 01-06-2007, 02:24 AM   #3
orbidewa

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is it possible to send information at the speed of light?
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Old 01-06-2007, 02:26 AM   #4
BenWired306

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I haven't seen stars in like 10 years. WTF's up with that? Is it always cloudy at night where I live or what? Seriously.
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Old 01-06-2007, 02:33 AM   #5
BenWired306

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Quote, originally posted by against the wall »is it possible to send information at the speed of light?
Of course. How else do you think Cozz would post on here all the way from Gliese 581?
:P
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Old 01-06-2007, 03:11 AM   #6
elossenen

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Here's an artist's impression.
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Old 01-06-2007, 03:16 AM   #7
SusanSazzios

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yeah, this could be it.
maybe there are people there too, maybe even another CSS community
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Old 01-06-2007, 03:56 AM   #8
Pa33anger

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Quote, originally posted by against the wall »is it possible to send information at the speed of light?
yeah, radio signals, telephone signals etc are all sent at the speed of light.
Quote, originally posted by CaymanS »If we can develop something that can travel at the equivalent of the speed of light, we're bound to get results real quick (20-30 years). If a regular NASA space shuttle, which travels at a speed of 20,000km/h, it would take around 680 years to reach it.
the problem is the speed of light would take a huge amount of energy to achieve (i'm no scientist, heck it may even be an infinite amount of energy)...the best way for practical interstellar travel would be a ship that could travel at a significant fraction of light speed, say 1/10 or 1/4 (nuclear pulse propulsion may be able to achieve that), or some way around the light speed barrier (warp drive, space folding, some sort of alternate dimension travel etc)...this is, of course, all assuming that the US government doesn't already have a reverse-engineered alien spaceship locked up in area 51
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Old 02-05-2007, 11:28 AM   #9
masaredera

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Quote, originally posted by erzhik »
maybe there are people there too, maybe even another CSS community
Naga moderates that one too.
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Old 02-05-2007, 11:30 AM   #10
masaredera

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Quote, originally posted by SV »

the problem is the speed of light would take a huge amount of energy to achieve (i'm no scientist, heck it may even be an infinite amount of energy)...the best way for practical interstellar travel would be a ship that could travel at a significant fraction of light speed, say 1/10 or 1/4 (nuclear pulse propulsion may be able to achieve that), or some way around the light speed barrier (warp drive, space folding, some sort of alternate dimension travel etc)...this is, of course, all assuming that the US government doesn't already have a reverse-engineered alien spaceship locked up in area 51
And once you figure out how to go so fast, no one has thought about slowing down.
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Old 02-05-2007, 11:49 AM   #11
Anakattawl

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Can i go to the other world? I'm sick of this one!
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Old 02-05-2007, 04:30 PM   #12
byncnombmub

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The Americans, Russians and Chinese will beat u there and by the time human beings will be able to travel so far ur great great great great great great great great great great great great great great great great great great greatg great great great great grandchild be be a few million dollars short of affording such a trip
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Old 02-05-2007, 04:50 PM   #13
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Quote, originally posted by Comrade »I haven't seen stars in like 10 years. WTF's up with that? Is it always cloudy at night where I live or what? Seriously.
Probably something to do with light pollution?
Since I moved to the middle of nowhere I often get to see a starry nights sky.
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Old 02-05-2007, 05:58 PM   #14
BenWired306

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Ahh, that could be it! That's a bit worrying if I'm honest
btw, I tried finding some stars last night and only saw about 3, the rest couldn't be spotted...
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Old 02-05-2007, 06:21 PM   #15
bonyclayd

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We live a little ways out of the city in NM; there's millions of stars, and they're so bright that even when there's no moon you can see clearly outside.
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Old 02-05-2007, 06:50 PM   #16
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death valley at night is unbelievable. theres no light besides cars for like 50 miles in (first sign of a hotel, furnace creek, is 103 miles in) and if you stop in the middle of nowhere in death valley you cant see anything at all. you jsut look up and see nothing but stars. theres nothing like it. except the downside is that at 9pm it was 117 degrees. so dont go in the middle of august.
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Old 02-05-2007, 09:15 PM   #17
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We will never be able settle on another planet because God won't allow it. When Jesus comes, takes His followers and cleanses them from sin, then they will be able to travel to other planets at the speed of thought. So, to me personally, I don't care much.
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Old 02-05-2007, 09:23 PM   #18
BenWired306

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Too bad sin doesn't have a bad aftermath while here on Earth, but instead it's sometimes even rewarded.
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Old 02-06-2007, 01:36 AM   #19
rsdefwgxvcfdts

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Quote, originally posted by Cozz »
Naga moderates that one too.
shhhhhH!
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Old 02-06-2007, 01:41 AM   #20
Pa33anger

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Quote, originally posted by jairo »We will never be able settle on another planet because God won't allow it. When Jesus comes, takes His followers and cleanses them from sin, then they will be able to travel to other planets at the speed of thought. So, to me personally, I don't care much.
i probably shouldn't even dispute that, i'll just say my opinion is different...i never believed in the apocolypse...maybe i watch too much star trek but i like to think humanity will one day colonize the galaxy
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