December 6, 2011 by staff
Kepler-22B NASA, In another step toward finding Earth-like planets that may hold life, NASA said on Monday the Kepler space telescope has confirmed its first-ever planet in a habitable zone outside our solar system.
French astronomers earlier this year confirmed the first rocky exoplanet to meet key requirements for sustaining life. But Kepler-22b, initially glimpsed in 2009, is the first the US space agency has been able to confirm.
Confirmation means that astronomers have seen it crossing in front of its star three times. But it doesn’t mean that astronomers know whether life actually exists there, simply that the conditions are right.
Such planets have the right distance from their star to support water, plus a suitable temperature and atmosphere to support life.
“We have now got good planet confirmation with Kepler-22b,” said Bill Borucki, Kepler principal investigator at NASA Ames Research Center.
“We are certain that it is in the habitable zone and if it has a surface, it ought to have a nice temperature,” he told reporters.
Spinning around its star some 600 light years away, Kepler-22b is 2.4 times the size of the Earth, putting it in class known as “super-Earths,” and orbits its Sun-like star every 290 days.
Its near-surface temperature is presumed to be about 72 degrees Fahrenheit (22 Celsius). Scientists do not know, however, whether the planet is rocky, gaseous or liquid.
The planet’s first “transit,” or star crossover, was captured shortly after NASA launched its Kepler spacecraft in March 2009.
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