Q. What is the number of known satellites of Jupiter?
Answer: 79
Notes: There are 79 known moons of Jupiter, and they form a satellite system known as Jovian system. The most massive of the moons are the four Galilean moons: Io; Europa; Ganymede; and Callisto, which were independently discovered in 1610 by Galileo Galilei and Simon Marius and were the first objects found to orbit a body that was neither Earth nor the Sun.

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