Saturn’s Aurora Australis

Taken on July 20 during a recent close pass grazing inside the rings, Cassini shot this amazing video of the southern lights on Saturn.  Saturn and Jupiter, like Earth, are known to have auroras, but it is exceptionally difficult to photograph them, as they are so faint.  Portraits of aurora are gorgeous, but they leave out the most fascinating piece — the wild, improbable rippling motion that they make as the magnetosphere moves.

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