WALTER MYERS / SCIENCE PHOTO LIBRARY WALTER MYERS / SCIENCE PHOTO LIBRARY
Jupiter's moons and the Earth. Computer artwork of Jupiter's four largest satellites laid out above the Earth and it's moon, showing their comparative sizes. From left to right, in order of their distances from Jupiter: Io, Europa, Ganymede, Callisto. These moons, also known as the Galilean satellites, were first observed by the Italian astronomer Galileo over 400 years ago, and are worlds in their own right.
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