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Life On New Earth-Size Kepler Planets?

From: Terry W. Colvin <fortean1.nul>
Date: Wed, 21 Dec 2011 18:50:51 +0700 (GMT+07:00)
Archived: Wed, 21 Dec 2011 07:20:43 -0500
Subject: Life On New Earth-Size Kepler Planets?


Source: FoxNews.Com


Date: Dec 21, 2011 5:24 AM

Could There Be Life On The New Earth-Size Kepler Planets?
By Natalie Wolchover

For life as we know it to arise on another planet, scientists
think the alien world must have three key ingredients: organic
molecules that can form complex structures, energy to jiggle
those molecules, and liquid water for them to jiggle in. It's a
short recipe, but nonetheless, only planets that are extremely
similar to Earth can possibly have all three items in stock.

If a planet is much closer to its star than we are to ours (and
assuming that star is similar in size to our sun), all the water
on its surface will evaporate in the heat. If it's much farther
away, all its water will freeze. Similarly, planets much larger
than Earth are gaseous, with no solid surface for an ocean to
slosh around on, while those much smaller wouldn't have had
enough gravity to form in the first place. Thus, in the search
for "candidate planets" which could host alien life, "alien
Earths" are the Holy Grail.

In a paper published today (Dec. 20) in the journal Nature, a
team of scientists who study data collected by NASA's Kepler
telescope report the discovery of a pair of exoplanets, or
planets outside our solar system, that are almost exactly the
same size as Earth. The distant worlds, labeled Kepler-20e and
20f, orbit a star called Kepler-20 located 950 light-years away,
and have diameters 0.87 times and 1.03 times that of Earth,

At those sizes, the planets' gravity would be strong enough to
make them rocky like Earth, rather than gaseous like Jupiter.
"Theoretical models suggest that the material inside the planet
could be iron in the core surrounded by a mantle of silicates,"
said Guillermo Torres, a member of the Kepler team based at the
Harvard-Smithsonian Center for Astrophysics. If that's the case,
they would have, respectively, masses 1.7 times and three times
Earth's mass, he said. [Infographic: Earth-Size Alien Worlds]

The planets are roughly Earth-size, but do they have what it
takes to sustain life? Unfortunately, not quite. "These are just
way too hot to be habitable," Torres told Life's Little

Both Kepler-20e and Kepler-20f orbit extremely close to their
star, with years just 6 days and 20 days long, respectively.
Though their star is slightly dimmer than our own, it still
blasts them with too much heat. "For the inner one, the
temperature is about 1,000 degrees Celsius [1,800 degrees
Fahrenheit], and for the outer one it's about 700 degrees C
[1,300 degrees F]," Torres said.

Unfortunately, that's far too hot for liquid water to survive.
And because there are no swirling oceans on the new planets =E2=80=94
no primordial soups for organic molecules to slosh around in =E2=80=94
there has been no genesis of life there, the scientists say.

But is there any chance that life that doesn't require water
could exist on Kepler-20e and 20f? Torres said he gets this
question a lot: "Why do we think that life has to be like we
have it here on Earth? Well, the thing is we don't have any
other examples of life, so we have to start with what we know.
We cannot rule out that there might be other types of life that
don't require water=E2=80=A6 if that's possible=E2=80=A6 but that seems a
little far-fetched."

Two weeks ago, the Kepler team announced its discovery of
another planet that was close to being habitable, but which
missed the mark for a different reason. "We announced Kepler-
22b, which has the right temperature for life, but it's too big.
Now, we're announcing a planet that's the same size as Earth but
it's too hot," said Dave Charbonneau, another member of the
Kepler team based at Harvard's CfA.

"What we're doing next is trying to look for a planet that's the
best of both worlds: Earth-size and the right temperature.
That's the big one," he said.


Terry W. Colvin
Ladphrao (Bangkok), Thailand
Pran Buri (Hua Hin), Thailand
[Terry's Fortean & "Work" itty-bitty site]

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