http://kepler.nasa.gov/news/nasakeplernews/index.cfm?fuseaction=
ShowNews&NewsID=172

http://tinyurl.com/btzmh9u

简单来说就是，克卜勒太空望远镜发现了半径是地球0.87倍的Kepler-20e
(比金星小)和半径是地球1.03倍的Kepler-20f，就这样！