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Saturday, November 19, 2011

ALIEN LIFE MAY LIVE IN VARIOUS HABITABLE ZONES

Habitable-zones

Of the approximately 1,500 exoplanets found so far, only a few are in the so-called habitable zone around their parent star. It's also called the "Goldilocks zone," a coveted sweet-spot where the amount of radiation coming from a star is "just right" for liquid water to exist on the surface of a rocky planet.

For example, Earth is within the present habitable zone around our sun, which is a comparatively narrow swath 18 million miles across.

Read More: http://news.discovery.com/space/planetary-habitable-zones-defined-by-alien-biochemistry-111118.html

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