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.