Skywatch

  • December 20, 2007

    Episode 135: Imagining Alternate Earths

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    We've found planets beyond our solar system, but nothing Earth sized. Still, astronomers are considering what such a world might look like. Computer models provide ideas of 14 different theoretical planet types, to help planet hunters spot telltale indicators. Researchers hope that the models will provide information about planet composition and similar characteristics when astronomers begin finding Earth-sized planets.