In the midst of chaos here on Earth, scientists are finding hope for life on other planets.

Scientists announced Thursday the discovery of three planets that are some of the best candidates so far for habitable worlds outside our own solar system -- and they're very far away.

NASA's Kepler satellite, which is keeping an eye on more than 150,000 stars in hopes of identifying Earth-like planets, found the trio.

Two of the planets -- Kepler-62e and Kepler-62f -- are described in a study released Thursday in the journal, Science. They are part of a five-planet system in which the candidates for life are the farthest from the host star.

The host star -- the equivalent of Earth's sun -- takes the name Kepler-62, where the individual planets are designated by letters thereafter.

The third planet that's potentially habitable, but not included in the Science study, is called Kepler-69c. Liquid water could theoretically exist on the surfaces of any of them, researchers said.
What are these planets like?

The smaller a planet is, the more likely it's rocky and the less likely it's made of gas, said William Borucki, Kepler science principal investigator at NASA Ames Research Center.

Kepler-62f is thought to be 40% larger than Earth and could be rocky, he said. It goes around its star once every 267.3 days (Earth days, that is).

Kepler-62e appears to be 60% larger than our planet and a little closer to its host star; this one could be a "water world" of mostly deep oceans, he said. It circles its star in 122.4 days.

"All these planets that we're finding are quite different than planets in our own solar system," Borucki said.

Kepler-69c appears to orbit a star similar to Earth's sun, Barclay said. As it's estimated to be about 70% larger than Earth, it may also be a water world, with oceans thousands of kilometers deep.

It's not likely to have a rocky surface, Barclay said. According to what little we know about it, Kepler-69 is probably significantly warmer than Earth.










http://www.cnn.com/2013/04/18/us/planet-discovery/index.html?hpt=hp_bn1

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