Relative sizes of the newly discovered habitable-zone planets and Earth. Left to right: Kepler-69c, Kepler-62e, Kepler-62f and Earth (except for Earth, these are artists' renditions). Image credit: ...

Alternately, while the rocky planet explanation is more likely, it's possible that these planets might be something we've never seen in our solar system: a water world. From L to R: Kepler-22b, Kepler ...

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The planets join a list of about 700 confirmed extra-solar planets discovered since 1995. The new additions include a pair of planets orbiting a star called Kepler-62, located about 1,200 light years ...