89.9 MB (3.7 MB compressed)
4579 x 6866 pixels
38.9 x 58.2 cm ⏐ 15.3 x 22.9 in (300dpi)
MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Ganymede is the largest of the four Galilean moons of Jupiter - indeed the largest moon of any known planet, bigger even than Mercury. Its surface is a mixture of ice, fractures and craters.
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