Gliese 581g was discovered in 2010.在此之前,Gliese 581d曾被认为是不适合生命存在的。 Gliese 581d was thought to be uninhabitable.Gliese 581 has six planets in its orbit.从超级地球行星Gliese 667Cc上看到的日落。 A sunset seen from the super-Earth planet Gliese 667 Cc. Gliese 832c orbits its host star every 36 days.
其中2颗位于恒星Gliese581和Gliese 667C的可居带里。 Two were located within the habitable zones of the stars Gliese 581 and Gliese 667 C. Gliese 832c在这里被描绘为被云层覆盖的温带世界.Gliese 832 c is represented here as a temperate world covered in clouds. 但在大约130万年的时间里,一颗名叫Gliese 710的矮星,预计将非常的接近地球。 But in about 1.3 million years, a dwarf star called Gliese 710 is expected to come quite close to Earth. Gliese 832c在这里被描绘为被云层覆盖的温带世界.Gliese 832 c is represented here as a potentially habitable, temperate world covered in clouds. 从地球上看,这枚火箭将花费16.7年的时间到达Gliese 876,并且最高速度达到0.993c。 Seen from Earth, the rocket will take 16.7 years to reach Gliese , and reach a maximum speed of 0.993 c. 因此,在之后的阶段对该名单进行改动并不是不可能,比如Gliese 581d就很可能会被剔除。 So changes to the list at a later stage are not impossible, and possibly Gliese 581 d could be such a case. 也许有一天,我们可能会收到类似Gliese 832c这样的行星发出的信号,但在给出回应时,我们必须保持警惕。 One day we might receive a signal from a planet like Gliese 832c, but we should be wary of answering back". 不过,由于Gliese 667C隶属于一个三恒星系统,意味着在行星上可以看到天空中有3个太阳。 Because Gliese 667C is part of a triple system, anyone standing on one of the planets would see three suns in the sky. 也许有一天,我们能收到类似Gliese 832c这样的行星发出的信号,但在给出回应时,我们必须保持警惕。 Maybe one day we can get a signal from a planet like Gliese 832C, but we have to be vigilant when we respond.". 图片中间的这颗星球叫做AC+793888,又被称为Gliese 445,它在距离地球17.6光年的地方。 At the center of this image is the star AC +79 3888, also known as Gliese 445, located 17.6 light-years from Earth. 这个地带或许真的是一个童话,因为后续研究现在对Gliese 581g行星是否存在提出了质疑。 This area may be really a fairy tale, because the follow-up study now the existence of the planet Gliese 581g questioned. 由于Gliese 667C是一个三恒星系统的一部分,如果你站在这些行星上,便能看到天空中有三个太阳。 Because Gliese 667C is part of a triple system, anyone standing on one of the planets would see three suns in the sky. 燃烧的冰虽然火和冰是完全对立的,但是一颗名为Gliese 436b的巨大系外行星被燃烧的冰所覆盖。 Burning Ice Although fire and ice are complete opposites, a huge exoplanet named Gliese 436b is covered in burning ice. Gliese 581行星系统非常类似于我们的太阳系,其内部有6颗行星在接近圆形的轨道上环绕恒星运行。The Gliese 581 planet system now vaguely resembles our own, with six worlds orbiting their star in nearly circular paths. 在此之前,天文学家必须解开Gliese 3470b是“超级地球”还是“亚海王星”的谜团。 Until then, astronomers have to solve another mystery about Gliese 3470 b: whether to call it a“super-Earth” or a“sub-Neptune.”. 由于Gliese 667C星球是三环系统的一部分,因此站在这三颗星球的任意一颗上,都能在天空中看到三个太阳。 Because Gliese 667C is part of a triple system, anyone standing on one of the planets would see three suns in the sky. 公元4万272年,航海家一号将以1.7光年的距离,飞过鹿豹座中的恒星Gliese 445附近。 In the year 40,272, the spacecraft will sail within 1.7 light-years of the star Gliese 445 in the constellation Camelopardalis. 科学家发现了“第二个地球”,被命名为Gliese 581c,但是最近研究结果表明它可能不适合人类居住. Scientists believed they had found a“second earth” known as Gliese 581c, but recent findings show it likely isn't habitable. 虽然16人被认为是相当接近的,但在130万年的时间里,一颗巨星Gliese 710特别接近。 While the 16 are considered reasonably near, a particularly close encounter of one star, Gliese 710, in 1.3 million years' time. Gliese 163c超级地球的质量是地球的七倍,可能是一颗岩质行星,或者也可能是一个较小的气态行星。Gliese 163c is about seven times the mass of Earth and has the potential to either be a rocky planet or a dwarfed gas giant. 这就是为什么我们发现的首批凉爽岩石质行星,都位于较冷的红色恒星周围(如Gliese 581d、Kepler-62e和Kepler-62f)。 This is why the first cool, potentially rocky planets we found orbit around cool red stars(like Gliese 581 d, Kepler-62e, and Kepler-62f). 因此,对于地球观测者而言,前往Gliese 876需要16.7年的时间,而火箭乘客时间的放缓意味着他们只过了5.6年。 So Earth observers would say the trip to Gliese actually took 16.7 years, but the slowing of the passenger's time means only 5.6 years passed for them. 图为目前已经发现的23颗可能宜居的地外行星,其中也包括了Gliese 832c,它是与地球最相似的三颗行星中距地球最近的一颗。 As has been found 23 possible habitable exoplanets, including Gliese 832C, which is the three planet most similar to earth from earth, the nearest one. 天文学家利用美国宇航局的哈勃望远镜和斯皮策太空望远镜来测量Gliese 3470b在绕恒星运行时吸收并反射的星光频率。 Astronomers used NASA's Hubble and Spitzer space telescopes to measure which frequencies of starlight Gliese 3470 b absorbs and reflects as it circles around its star.
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