The first astronomer to discover moons around Jupiter was Galileo, back in the year 1610, but astronomers are still finding more and more moons around this gas giant.
Supermoons in general appear 17% bigger and 30% brighter than when the moon is at its farthest point away from Earth, according to NASA.
NASA's Juno spacecraft traveled to 645 miles above the surface of the solar system's largest moon, Ganymede, on Monday.
