Kepler开普勒(望远镜) The most-prolific planet hunter took flight on March, 2009. 2009年3月,迄今最高产的“行星狩猎者”发射成功。By the time it was retired, late last year, Kepler had discovered about 5500 con firmed or possible plan ets. And astronomers wi 11 sift through its decade of observations for decades more.截至去年开普勒太空望远镜退役,它一共发现了5500颗已确定或待确定的行星。天文学家们还将用数十年时间来筛选它过去十年的观测数据。