Potentially habitable planet found

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ShaneHaughey
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Potentially habitable planet found

Postby ShaneHaughey » Wed Apr 25, 2007 1:57 am

Potentially habitable planet found

WASHINGTON - 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.


I call dibs and claim this world for the Glorious city of Seattle and for the Arch-Prince, Stan Marsh.
That's how it's down here on the farm!
krunchyfrogg
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Postby krunchyfrogg » Wed Apr 25, 2007 12:37 pm

Cool. Do you have a link to that article? TIA
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becky-s-potter
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Postby becky-s-potter » Wed Apr 25, 2007 3:10 pm

lmao.... Are the scientologists going to be the first to inhabit it as they flee west to escape religous persecution?
I am way too old for this...
ShaneHaughey
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Postby ShaneHaughey » Wed Apr 25, 2007 5:40 pm

That's how it's down here on the farm!
Big-Will
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Postby Big-Will » Wed Apr 25, 2007 6:08 pm

If you're gonna post some news, do it this way:

1. Post the link first, with the title if you can, like [link=url]news headline[/link]
2. Copy and past the article, highlight any parts you want the reader to focus on, then put the [quote] tags around it.
3. Post your comments about it.
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ShaneHaughey
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Postby ShaneHaughey » Wed Apr 25, 2007 6:11 pm

Big-Will wrote:If you're gonna post some news, do it this way:

1. Post the link first, with the title if you can, like [link=url]news headline[/link]
2. Copy and past the article, highlight any parts you want the reader to focus on, then put the
tags around it.
3. Post your comments about it.


I usually do that but didn't this time and then someone asked for the link, so just to make sure said person didn't think I was cheating him(as people often just check for new replies to old topics) I posted the link.
That's how it's down here on the farm!
O'Brien
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Postby O'Brien » Wed Apr 25, 2007 8:15 pm

If life can be supported on this newly-discovered planet, does that mean Earth can get rid of its homeless probelm by merely sending the homeless there? :D
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Jay C
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Postby Jay C » Wed Apr 25, 2007 9:09 pm

*waits for hainted to suggest we check it for oil*
Read my horrible webcomic you fat assh*le!
BRMBug
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Postby BRMBug » Wed Apr 25, 2007 9:48 pm

I already checked it, it's a quart low.
triplemultiplex
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Postby triplemultiplex » Wed Apr 25, 2007 10:02 pm

Give us a couple generation and we'll be the 'little green men' for the inhabitants of planets like this one.

If we could only do something about that pesky warp barrier.

"Dr. Cochrane; paging Dr. Zephram Cochrane..."
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EPAF
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Postby EPAF » Wed Apr 25, 2007 10:19 pm

They say it's approximately 180,000,000,000,000 miles away from Earth......and in case you can't be bothered to work it out and you've skipped reading that number - that's 180 Million Million Miles.

I guess that'd be one hell of an annoying journey for parents when they try to get their kids to shut up saying, "Are we there yet? Are we there yet?! Are we there yet?!? Are we there yet?!?!"

If human life does eventually live on that planet and build colonies and STUFF, I hope they'll be a bit more creative and not just call them 'New......*Insert Existing Name of City/Country*'. :roll:
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Kyle the Skeptic
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Postby Kyle the Skeptic » Thu Apr 26, 2007 12:53 am

30.6 light years. Even traveling at the speed of light, that would still be one hell of a long and boring trip.
jjmac12345
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Postby jjmac12345 » Thu Apr 26, 2007 3:29 am

This is awesome.
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FreedomFighterXL
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Postby FreedomFighterXL » Thu Apr 26, 2007 3:31 am

Yeah, no way to conclusively prove their's life on there, though it seems very promising. I honestly think it's better to answer the question of life on other planets just by waiting to receive radio signals. At least those for sure can travel at light speed. Despite this, there was an article from Military.com that I read a few years ago where meta-physicists came up with a theory that in separate dimensions, where the speed of light is 50, or even a hundred times faster, it may be possible to surpass the 186,000 mps speed typically associated with light in our universe.

If this could be harnessed, then visiting this planet wouldn't be much trouble at all. It sounds crazy, but then again several decades ago it was believed that we couldn't travel past the speed of sound. They figured that at this point, your aircraft would just explode in midair.
Traveling lightspeed is crazy nonetheless, but who knows?
ShaneHaughey
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Postby ShaneHaughey » Thu Apr 26, 2007 9:18 pm

EPAF wrote:They say it's approximately 180,000,000,000,000 miles away from Earth......and in case you can't be bothered to work it out and you've skipped reading that number - that's 180 Million Million Miles.

I guess that'd be one hell of an annoying journey for parents when they try to get their kids to shut up saying, "Are we there yet? Are we there yet?! Are we there yet?!? Are we there yet?!?!"

If human life does eventually live on that planet and build colonies and STUFF, I hope they'll be a bit more creative and not just call them 'New......*Insert Existing Name of City/Country*'. :roll:

The Planet's Name: Marsh
The Capital: Stanley
The Continent that the Capital is located on: Seattle 2.0:P
That's how it's down here on the farm!

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