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NASA's Kepler spacecraft is a prolific hunter of planets outside of our Solar System. Since it launched in 2009, Kepler has confirmed more than 1000 of these exoplanets and catalogued thousands of more candidates. The menagerie includes planets with densities greater than iron and lower than Styrofoam; planets smaller than Mercury and bigger than Jupiter; planets with one sun, two suns, and even four suns!

Harvard-Smithsonian Center for Astrophysics with several colleagues, say they found a planet in M51 Whirlpool Galaxy some 23 million light years from Earth near the constellation of Ursa Major.