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Back Jupiter's Galilean Satellites

Jupiter's Galilean Satellites


Depicts: Io, Europa, Callisto, Ganymede, Jupiter
Copyright: K. Noll (STScI), J. Spencer (Lowell Observatory), and NASA

This is a Hubble Space Telescope "family portrait" of the four largest moons of Jupiter, first observed by the Italian scientist Galileo Galilei nearly four centuries ago.

Located approximately one-half billion miles away, the moons are so small that, in visible light, they appear as fuzzy disks in the largest ground-based telescopes. Hubble can resolve surface details seen previously only by the Voyager spacecraft in the early 1980s.

Last Update: 1 September 2019
14-Apr-2026 21:40 UT

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