NASA宣布发现另一个地球（视频）
天文学家表示，迄今发现最接近“另一个地球”的系外行星名称为Kepler 452b。相似指数 0.98。这颗行星距离地球1400光年，绕着一颗与太阳非常相似的恒星运行。那颗恒星的质量比太阳多4%，亮度则要多出10%。开普勒452b到那颗恒星的距离，跟地球到太阳的距离相同。
天文学家称，这是至今为止发现的最接近地球的“孪生星球”，有可能拥有大气层和流动水。
NASA表示，开普勒452b被称为地球2.0。
"http://player.youku.com/player.php/Type/Folder/Fid/25942173/Ob/1/sid/XMTI5MjA5OTgzMg==/v.swf
WASHINGTON, July 23 (Xinhua) -- NASA will announce new discoveries made by
the planet-hunting Kepler Space Telescope later Thursday, and that could be
"another Earth," U.S. mediareported.
At an audio press conference scheduled for 1700 GMT, NASA could "make one
of the mostsignificant announcements in inter-planetary exploration since the
space race first begun," TheHuffington Post said.
In a brief statement about the announcement, NASA claims that it could
unveil "something peoplehave dreamed about for thousands of years."
Since Kepler was launched in 2009, the Earth-hunting telescope has been
spectacularly earning itsmoney discovering 4,661 candidate planets and 1,028
planets.
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