Astronomy Picture of the Day
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September 6, 1995
Callisto: Dark Smashed Iceball
Callisto is a dirty battered world, showing the most beaten surface of
Jupiter's major moons. Made of a rocky core
covered by fractured ice,
Callisto's past collisions with large meteors are evident as large
craters surrounded by concentric rings. The four largest moons of Jupiter:
Callisto were all discovered by
Marius in 1610 with early telescopes and are now known as the
Galilean satellites. The
NASA spacecraft Galileo
is scheduled to arrive at Jupiter is December of 1995.
Tomorrow's picture: Distant Galaxies
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