Astronomers have announced the discovery of 50 (yes, five-zero) exoplanets, the largest group of alien worlds announced at one time. Sixteen of these worlds are

Astronomers have announced the discovery of 50 (yes, five-zero) exoplanets, the largest group of alien worlds announced at one time. Sixteen of these worlds are "super-Earths" -- exoplanets that possess masses larger than Earth, yet much lower than the gas giants.