NASA spots tiny Earth-like planet
NASA has spotted a tiny, rocky planet about the size of Earth doing a
speedy orbit of a star outside our solar system, but its scorching
temperatures are too hot for life, the space agency said Monday.
The exoplanet, named Kepler-10b, is the smallest-ever planet
discovered outside our solar system, and was located by NASA’s Kepler
spacecraft.
It is about 1.4 times the size of Earth and spins around its star
more than once a day, an orbit much too close for life to survive.
NASA artist’s concept shows the smallest star known to host a
planet. AFP |
“Kepler-10b is definitely NOT in the habitable zone as we define it.
The dayside temperature of the planet is expected to be higher than
2,500 F (1,371 Celsius)!!” NASA expert Natalie Batalha said in a web
chat to describe the discovery.
“That’s hot enough to melt iron!” she added.
“It wouldn’t be a very nice place for organisms like those on Earth
to live. Carbon-based chemistry wouldn’t thrive there. Molecules
comprising RNA and DNA couldn’t stay intact in such extreme
temperatures.”
The planet completes a full orbit once every 0.84 days, and is 23
times closer to its star than Mercury is to our sun.
According to Douglas Hudgins, Kepler program scientist at NASA, the
discovery is promising even though no life could exist there.
“The discovery of Kepler 10-b is a significant milestone in the
search for planets similar to our own,” said Hudgins.
“Although this planet is not in the habitable zone, the exciting find
showcases the kinds of discoveries made possible by the mission and the
promise of many more to come,” he said.
The new planet has a mass 4.6 times that of the Earth, and an average
density of 8.8 grams per cubic centimeter, similar to an iron dumbbell,
NASA said.
The findings are described in the Astrophysical Journal.
Batalha, a professor at San Jose State University and deputy science
team lead for NASA’s Kepler Mission, said that there is evidence of
another potential planet in the same star system, but little is yet
known about it.
“There is actually already a very compelling signature of another
potential planet in this system,” said Batalha. “There is a transit
event that recurs once every 45 days and is suggestive of a planet a bit
larger than two times the radius of the Earth.”
Kepler is NASA’s first mission in search of Earth-like planets
orbiting suns similar to ours.
It launched in 2009, equipped with the largest camera ever sent into
space — a 95-megapixel array of charge-coupled devices — and is expected
to continue sending information back to Earth until at least November
2012.
The space telescope is searching for planets as small as Earth,
including those orbiting stars in a warm, habitable zone where liquid
water could exist on the surface of the planet.
AFP |