This photo illustration shows selected moons of our solar system at their correct relative sizes to each other and to Earth. Pictured are Earth's Moon; Jupiter's Callisto, Ganymede, Io and Europa; Saturn's Iapetus, Enceladus, Titan, Rhea, Mimas, Dione and Tethys; Neptune's Triton; Uranus' Miranda, Titania and Oberon and Pluto's Charon. Credit: NASA.
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