Jupiter's Galilean Satellites

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 (about 805 thousand kilometres), 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.


K. Noll (STScI), J. Spencer (Lowell Observatory), and NASA/ESA

About the Image

NASA press release
NASA caption
Release date:10 October 1995, 05:00
Size:600 x 700 px

About the Object

Name:Callisto, Europa, Ganymede, Io
Type:Solar System : Planet : Satellite
Category:Solar System

Image Formats

Large JPEG
69.8 KB
Screensize JPEG
158.0 KB

Colours & filters

Hubble Space Telescope

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