Respuesta :
Answer:
four orbits
Explanation:
Io's orbit is kept from being exactly circular by the gravity of its Galilean neighbor Europa and the more distant Ganymede. Io, Europa, and Ganymede have a 4:2:1 orbital resonance that keeps their orbits elliptical. For every four orbits of Io, Europa orbits twice and Ganymede orbits once.
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Galilean will orbit around Jupiter 1/2 a lap by the time Europa orbits around once and when Io orbits around Jupiter twice.
When Galilean orbits around Jupiter 1 time, Europa goes around 2, and Io 4. When the question asked you how many times will Galilean orbit when Europa orbits Jupiter 1, and Io 2 times, all you need to do is divide 1 by 1/2 because 1 is half of 2 (Europa) and 2 is half of 4 (Io).