MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Computer artwork of the Solar System's seven largest natural satellites, comparing them on the same scale. From largest to smallest, they are (anti-clockwise from right): Jupiter's Ganymede (2631 km), Saturn's Titan (2576 km), Jupiter's Callisto (2410 km), Jupiter's Io (1830 km), the Earth's Moon (1737 km), Jupiter's Europa (1569 km) and Neptune's Triton (1353 km). These are the largest moons by some margin, with the next largest, the Uranian satellite Titania, being only 58% the size of Triton.
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