美国宇航局宣布发现“另一个地球”:开普勒-452b

Comment(s)打印 E-mail China.org.cn  2015-07-24

美国宇航局于2015年7月23日在音频新闻发布会上宣布,天文学家发现了迄今为止最接近“另一个地球”的系外行星。这颗被命名开普勒-452b的行星位于天鹅座,距离地球1400光年。该行星围绕恒星开普勒-452公转,这颗恒星与太阳相似,年龄是60亿年,比太阳还要年长15亿年。行星开普勒-452b距恒星的距离适宜,位于宜居带中。宜居带温度条件适宜,有可能会存在液态水。尽管目前尚不能确认开普勒-452b是否为固态行星,但它无疑是与地球最相近的一颗系外行星,对此参照便能了解并预测地球的演变与发展。这是开普勒太空望远镜的又一项重大发现。2009年3月开普勒太空望远镜发射升空,是全球首个专用于搜寻太阳系外类地行星的航天器。
Astronomers hunting for another Earth have found what may be the closest match yet, a potentially rocky planet circling its star at the same distance as the Earth orbits the Sun, NASA said July 23, 2015. Not only is this planet squarely in the Goldilocks zone -- where life could exist because it is neither too hot nor too cold to support liquid water -- its star looks like an older cousin of our Sun, the US space agency said.That means the planet, which is 1,400 light-years away, could offer a glimpse into the Earth's apocalyptic future, scientists said. Known as Kepler 452b, the planet was detected by the US space agency's Kepler Space Telescope, which has been hunting for other worlds like ours since 2009.



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