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Waspie_Dwarf

Rotation of Planets Influences Habitability

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Rotation of Planets Influences Habitability

There are currently almost 2,000 extrasolar planets known to us, but most are inhospitable gas giants. Thanks to NASA’s Kepler mission, a handful of smaller, rockier planets have been discovered within the habitable zones of their stars that could provide a niche for alien life.

The habitable zone of a star is typically defined as the range from a star where temperatures would allow liquid water to exist on the surface of a planet. At the inner edge of this zone, the star’s blistering heat vaporizes the planet’s water into the atmosphere in a runaway greenhouse effect. At the outer edge of the habitable zone, temperatures are so cold that clouds of carbon dioxide form and the little solar energy that does arrive bounces off the clouds, turning the planet into a frozen wasteland.

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