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789
专家发现疑似宜居的星球。
一班来自多国的天文学家近日在距离地球31光年的外太空,发现一个疑似适合人类居住的行星。该行星与另外2个行星一起,围住1个体积只有太阳三分之一的恒星运行。
负责领导研究,来自西班牙加那利天体物理研究所的专家卢克表示,他们在恒星“GJ 357”的周围发现该3个行星,它们分别是“GJ 357 b”、“GJ 357 c”及“GJ 357 d”。
今年2月,美国太空总署(NASA)的凌日系外行星勘探卫星(TESS)亦发现该恒星每隔3.9日就会稍为变暗,证明有行星围住它运转,每当转到它面前时就会遮住它发出的部分光,也即是说,它们组成了一个星系。该恒星是一个M型矮星,温度比太阳冷40%。“GJ 357 b”体积比地球大22%,它与“GJ 357 c”一样,离恒星太近,因此温度很高,不适合人类居住。
不过,距离最远的“GJ 357 d”则有可能是宜居的星球。它与恒星的距离,与火星跟太阳的距离相若;其质量估计是地球的1倍至2倍。它的温度大约是摄氏-53度,但若有大气层,它就可以保存自恒星吸收而来的温度,可能有液态水,人类或可居住。
团队用径向速度来测量“GJ 357 d”,但方法不足以证明它是否宜居。团队表示,只有当它转到恒星及地球中间时,才可正确地观察其体积、密度及成分,但这机会很少有。有关研究周三刊登在《天文与天体物理学报》期刊。
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