Hot new planet could be in habitable zone -- barely

September 12, 2011 By SETH BORENSTEIN , AP Science Writer
This artist rendering provided by The Europeans Southern Observatory shows the planet orbiting the Sun-like star HD 85512 in the southern constellation of Vela (The Sail). This planet is one of sixteen super-Earths discovered by the HARPS instrument on the 3.6-metre telescope at ESO’s La Silla Observatory. This planet is about 3.6 times as massive as the Earth lis at the edge of the habitable zone around the star, where liquid water, and perhaps even life, could potentially exist. Astronomers have confirmed a second planet outside our solar system that seems to be in the right place for life _ just barely. But it would be a steam bath world: hot, sticky and downright uncomfortable. (AP Photo/artist rendering provided by The Europeans Southern Observatory)

Astronomers believe they have found a second planet outside our solar system that seems to be in the right zone for life, just barely. But it would feel like a steam bath - hot, sticky and beyond uncomfortable.

European astronomers announced the discovery Monday along with about 50 other planets outside our solar system at a conference in Moran, Wyo. The most exciting of those planets is only the second to be confirmed as lying in what astronomers call the , or the Goldilocks zone. That means it's not too hot and not too cold for to be present. Water is the key to a planet being able to support Earth-like , scientists say.

Only one of the past discoveries of such Goldilocks planets has held up. That was a planet found in 2007. And even this new one comes with an asterisk: The planet would need to have water and be a rocky, solid planet like Earth, not one that's primarily gas like .

The new planet is about 3.6 times the mass of Earth. Temperatures there may range from 85 to 120 degrees with plenty of humidity.

"It's going to be really muggy, just think about the muggiest (Washington) day you can think of," said study author Lisa Kaltenegger, an with the Max Planck Institute in Germany. "We're not saying it's habitable for you and me."

But other types of life - probably shorter and squatter life - could conceivably take root there, she said. They would probably be closer to the ground than humans because gravity on this larger-than-Earth planet is about 1.4 times what we experience, she said.

For it to be considered livable by astronomers, at least 60 percent of it would have to be covered in clouds, said Kaltenegger. Earth has about 50 percent cloud cover, so 60 percent seems reasonable, she said.

The new planet, called HD85512b, closely circles a star about 35 light-years from Earth in the Vela. Each light-year is 5.8 trillion miles. A year there is only 60 days. The only reason it might not too hot for life is that its sun is about 1,800 degrees cooler than our sun, Kaltenegger said.

The new batch of planets, including the potentially habitable one, were found by the European Southern Observatory's special planet-hunting instrument called HARPS is based in Chile. The finding doubles the number of planets that are closer to in mass than those closer to Jupiter's size.

Reports on them appear in four papers published in scientific journals to coincide with the Wyoming conference, Extreme Solar Systems II. This new planet was observed more than a thousand times over 200 nights of tracking from Chile so astronomers are confident with their findings, said study author Francesco Pepe of the Geneva Observatory in Switzerland.

In addition to the two European discoveries of potentially habitable , a NASA telescope has identified more than 50 other candidates, but those still need further confirmation.

Explore further: NASA spots 54 potentially life-friendly planets


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3.7 / 5 (6) Sep 12, 2011
Interesting, these temperature ranges are a bit confusing. This doesn't agree with what Chad Meyers said just now on television, so maybe he was mistaken.

But 85 to 120 degrees when and where?

Is that mean? Summer? Winter? Day time high vs night time low? What?

Damn, so little useful information.

If that is the day time highs, then that's like...Earth..

If that's night time lows vs day time highs, then it's quite a bit warmer than earth, but then again, how did they calculate this?

If that is a polar low vs a tropical high, then the planet would be in near thermal equilibrium...

Even still, as I said on the other article about this planet, this easily makes it the most earth-like object ever discovered so far...
5 / 5 (4) Sep 12, 2011
Agreed. Why can't these press releases be more informative? "85 to 120 degrees" what??? I assume not Celsius.
1 / 5 (3) Sep 12, 2011
Wish there was some information about its atmospheric content. That could tell us more about what this planet is really like, and whether it's actually like Earth.
5 / 5 (1) Sep 13, 2011
"If clouds were increasing the albedo of
HD 85512 b, its surface could remain
cool enough to allow for liquid water if
present. HD 85512 b is a planet on the
edge of habitability"

"Opposite to HD20794, however, its parent star is much less luminous.
The computed equilibrium temperature is only 298K if we again assume an albedo of 0.3. This sets this possibly rocky planet at the inner edge of the habitable zone of its parent star."
not rated yet Sep 13, 2011
Given less dense atmosphere due lower gravity, a face-locked 'Mega-Moon' of such a planet should have ample area within 'habitable zone. 'Planet-shine' may mitigate night cooling...
not rated yet Sep 14, 2011
No life on that planet.


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