The year's most extreme space discoveries

The year's most extreme space discoveries

This artist's concept shows the newfound alien planet Alpha Centauri Bb, found in a three-star system just 4.3 light-years from Earth. (ESO/L. Calçada/SPACE.com)

Record-shattering phenomena, including a supermassive black hole, set the standard in 2012. 'Tiny' planets

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