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最新托福听力背景知识:宇宙中的宜居星球

2016-03-14 16:13:06来源:网络

  It found that Gliese 581g has a mass three to four time the Earth's and orbits its star in just under 37 days. Its mass indicates that it is probably a rocky planet with a definite surface and enough gravity to hold on to an atmosphere.

  Gliese 581 has two previously detected planets that lie at the edges of the habitable zone where the atmosphere is just the right temperature for liquid water to exist - one on the hot side (planet c), the other on the cold face (planet d).

  研究发现,Gliese 581g的质量是地球的3-4倍,公转周期仅为37天不到。Gliese 581g的质量显示,它可能是一颗岩态行星,有着固定的表面和足以吸住大气层的引力。 宜居带内的大气温度适宜,可能有液态水存在。之前发现的2颗Gliese 581行星都位于宜居带的边缘,其中一颗位于热侧(行星c),另一颗位于冷侧(行星d)。

最新托福听力背景知识:宇宙中的宜居星球

  The planet is tidally locked to the star, meaning that one side is always facing the star and basking in perpetual daylight, while the side facing away from the star is in perpetual darkness.

  One effect of this is to stabilize the planet's surface climates, according to Vogt. The most habitable zone on the planet's surface would be the line between shadow and light (known as the 'terminator').

  这颗行星与恒星潮汐锁定,这意味它的一面始终朝向恒星,永久沐浴在日光之中,而背离恒星的一面则永久处于黑暗之中。Vogt称,这一现象的一个作用是使该行星的表面气候稳定。这颗行星上最适宜居住的区域是黑暗与光明之间的交界线(被称为“明暗界线”)。

  Read more:

  http://www.dailymail.co.uk/sciencetech/article-2066185/Gliese-581g-Newly-discovered-planet-just-like-Earth-contain-liquid-water.html

  http://article.yeeyan.org/view/260717/238621

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