This is the first announcement of a candidate Earth-size planet by the Kepler mission, which in March 2009 launched a one-ton spacecraft to search for planets like ours that just might harbor life.

这是开普勒团队首次宣称的地球大小的行星候选星，在2009年3月，开普勒团队曾发射一艘一吨重的宇宙飞船去寻找像地球一样可能存在生命的行星。