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| h English (en) | Other factors also come into play. A [[world]] sitting close to the [[Star|main star]] might have its atmosphere stripped away by the destructive energy of the star's [[solar wind]] sweeping past. The only chance a planet has of retaining its layer of gasses in this situation, is if it also benefits from a molten core that is producing a protective [[magnetosphere]]. Compare the [[Earth]], whose atmosphere is shielded by its magnetosphere, with [[Mars]]. The [[Mars|red planet]] has a [[Trace Atmosphere|trace]] or [[very thin atmosphere]] that was considerably thicker in ancient times, but as the planet cooled it first lost its magnetosphere and then its atmosphere. {{Page cite|name=The Universal World Profile|page=13}} |