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Extrasolar planet at 51 Pegasi
Pluto and its moons, Charon, Hydra, Nix, Kerberos, and Styx

ESO/M. Kornmesser/Nick Risinger (skysurvey.org)

This artist's view shows a giant extrasolar planet orbiting the star 51 Pegasi, located 51 light-years from Earth. Astronomers using ground-based telescopes found the planet in 1995, marking the first extrasolar planet discovered around a star similar to our sun. The planet is roughly half the size of Jupiter and is orbiting dangerously close to its star.