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Magnetosphere

A magnetosphere is the region around an astronomical object in which phenomena are dominated or organized by its magnetic field.

Earth is surrounded by a magnetosphere, as are the magnetized planets Jupiter, Saturn, Uranus and Neptune.

Note:   The above text is excerpted from the Wikipedia article "Magnetosphere", which has been released under the GNU Free Documentation License.
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July 4, 2015

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updated 12:56 pm ET