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The image of Saturn's magnetosphere (a) was captured by the Ion and Neutral Camera (INCA), part of the Magnetospheric Imaging Instrument (MIMI) on NASA's Cassini spacecraft, shortly after Cassini entered the planet's orbit in July 2004. On June 20-21, 2004, as Cassini approached Saturn's orbit, the energetic neutral atom (ENA) emissions captured by INCA (b) revealed that the magnetosphere rotated around the planet once about every 11 hours.

Credit: Johns Hopkins University Applied Physics Laboratory (as published in the 25 February 2005 issue of Science.)

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