http://www.planetary.org/blog/article/00002057/ wrote:
Io eclipses and transits Ganymede
On August 16, 2009, amateur astronomer Christopher Go captured this fourteen-frame animation on two of Jupiter's moons. You can see smaller Io's shadow cross Ganymede just before the moon itself transits. Credit: © Christopher Go, Cebu, Philippines
Io eclipses and transits Ganymede
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Io eclipses and transits Ganymede
Art Neuendorffer