• May 31, 2007

    Episode 102: Water Everywhere?

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    A remarkable planetary system around a red dwarf star, called Gliese 581, seems to have at least three planets. One planet, close to the parent star, appears to be five times the mass of Earth and only 1.5 times its radius. It whizzes around the star in only 13 days! Most intriguingly, its position could mean that its temperatures would be mild enough to allow liquid water to exist. This is the first Earth-like planet found in that important range, known as the "habitable zone."