The Top Exoplanet Discoveries of 2013

摘要

Some of the strangest details of the 3,500 likely alien worlds detected so far were discovered last year. This rocky planet identified in April is closer to Earth's size than any other world found in the habitable zone, the region around a star where surface water neither completely freezes nor boils away. This "super-Earth" is only 40 percent bigger than our planet.