Habitable alien planet. Artwork of land and oceans on an Earth-like alien planet. A planet's orbit and its size have to fit within a narrow range in order to have a surface temperature suitable for liquid water, and to retain an atmosphere. In the background is the bright band of stars that is the Milky Way galaxy. The number of other habitable planets in the Milky Way is not known, but has been estimated at anything between 1 (just Earth) and as many as 10 billion. (KEYSTONE/SCIENCE PHOTO LIBRARY/ DETLEV VAN RAVENSWAAY) === ===
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