Story Highlights
• NEW: Planet could conceivably house life outside our solar system
• NEW: Discovery a "significant step" on way to finding possible
life in universe
• NEW: Planet, dubbed 581 c, orbits red dwarf star Gliese 581
• NEW: Newly found planet full of liquid water, scientist believes[/color]
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 11/2
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
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.
