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See the shadows of three moons dot Jupiter's clouds in a triple eclipse

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via <a href="http://svs.gsfc.nasa.gov/vis/a010000/a011300/a011346/s3-1024.jpg">svs.gsfc.nasa.gov</a>
via svs.gsfc.nasa.gov

The biggest of the four major moons of Jupiter — Ganymede, shown above — is three-quarters the size of Mars and larger than any other moon in our solar system. But even it is dwarfed by the planet itself, bigger than a thousand Earths. When a solar eclipse happens on Jupiter, the planet virtually subsumes the moon, which casts a small black shadow against Jupiter's surface. But on March 28th, 2004, three of those moons converged for a truly gorgeous series of shots caught by the Hubble space telescope. The video below, shot at various near-infrared wavelengths, shows a triple eclipse casting shadows on the surface of Jupiter. The shadows of Io, Ganymede, and Callisto can all be seen in the video, and a NASA image points out which is which. And a fourth major moon, Europa, remains invisible on the other side of the planet.

Video credit: NASA/ESA/University of Arizona/E. Karkoschka