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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?

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The search for habitable, Earth-like planets keeps turning up promising candidates.

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And although astronomers have yet to find an Earth twin, some newly discovered worlds are pretty interesting in their own right.

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NASA's Kepler space telescope recently spotted seven new exoplanets,

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three of them in or near their stars' so-called habitable zones.

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That's the temperate region where a planet could accommodate liquid water.

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But all three worlds are bigger than Earth, and their composition is uncertain.

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They could be rocky like Earth or water worlds without landmasses.

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The discoveries are in the journal Science and in the Astrophysical Journal.

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The planet Kepler 69c follows a Venus-like orbit around a sunlike star.

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Kepler 69c could be habitable, or it could be a bit too hot, depending on how much starlight the planet absorbs.

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Kepler 62e and 62f are smaller, and orbit a star smaller than the sun.

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One planet receives about 60 percent less radiation than warms Earth, and the other gets about 20 percent more.

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It's possible that those attributes render Kepler 62e or 62f habitable,

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but astronomers don't yet know whether they are too cold, too hot or just right.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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