开普勒20f
开普勒20f（Kepler-20f）是一个环绕位于天琴座，距离地球950光年的恒星开普勒20的太阳系外行星。该行星是开普勒太空望远镜确认第一个环绕类太阳恒星的体积与地球相若的行星。该行星的半径是地球的1.03倍，表面温度大约是427°C。该行星距离母恒星1600万公里，相当于水星环绕太阳轨道范围内。这个发现首次印证了开普勒太空望远镜可以观测到体积与地球相若的太阳系外行星[1][2][3][4]。
参考资料
- ^ Johnson, Michele. NASA Discovers First Earth-size Planets Beyond Our Solar System. NASA. 20 December 2011 [2011-12-20]. （原始内容存档于2019-05-04）.
- ^ Hand, Eric. Kepler discovers first Earth-sized exoplanets. Nature. 20 December 2011 [2011-12-20]. （原始内容存档于2012-01-04）.
- ^ Moskowitz, Clara. First Ever 'Earth-Sized' Alien Planets Discovered. Fox News Channel. 20 December 2011 [2011-12-20]. （原始内容存档于2011-12-25）.
- ^ 存档副本. [2011-12-21]. （原始内容存档于2013-01-26）.
外部链接
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