In April astronomers at the Geneva Observatory announced the discovery of the most Earth-like exoplanet yet located, the first rocky world beyond our solar system that could hold liquid water.

• 就在4月，日内瓦天文台宣布首度发现太阳系外能够保有液态水的岩石世界，这是目前所找到与地球最相似的系外行星。