http://kepler.nasa.gov/news/nasakeplernews/index.cfm?fuseaction= ShowNews&NewsID=172 http://tinyurl.com/btzmh9u 簡單來說就是,克卜勒太空望遠鏡發現了半徑是地球0.87倍的Kepler-20e (比金星小)和半徑是地球1.03倍的Kepler-20f,就這樣!