• May 14, 2009

    Episode 218: New Planet Sparks Curiosity

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    Astronomers have searched diligently for a planet of the size of Earth. Researchers would love to find such a planet in the zone appropriate for liquid water ? what they call "the habitable zone." New observations from the European Southern Observatory indicate that the star Gliese 581 has a fourth planet in addition to the known 3. The other planets are large "super earths" and one Neptune-sized planet. But the new planet is about twice the mass of Earth, and could be close to the habitable zone as well.