Galilean satellite


Galilean satellite
Any of the four large satellites of Jupiter discovered by Galileo in 1610.

In order of distance from Jupiter: Io (the most volcanically active body in the solar system), Europa (suspected to contain a liquid ocean under its frozen surface), Ganymede (the largest satellite in the solar system), and Callisto. Both Ganymede and Callisto are larger than Pluto and Mercury.

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Universalium. 2010.