The Feeling’s Mutual

Saturn's moons Rhea and Dione pass by each other

Dione slips behind Rhea in this animation made from 19 raw images taken by the Cassini spacecraft on January 20, 2011. Called a mutual event, the two moons seem to just miss each other – even though in reality they are separated by over 93,400 miles!

Rhea and Dione are similar in composition and size,. Both made of mostly water ice and rock, heavily cratered and scarred by bright icy cliff faces. they are 950 and 700 miles wide respectively.

Images: NASA / JPL / SSI. Animation by J. Major.

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