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【题目】天文学家们仍然在孜孜不倦地寻找可能孕育生命的星球。最近发现的一颗编号Kepler 452b的天体,直径约为地球的1.6倍,绕着一颗与太阳类似的恒星运行,与恒星之间的距离与日一地距离相近,距离地球1400光年,是迄今最接近另一个地球的系外天体。回答下列问题。

【1】Kepler 452b所在的天体系统是

A.太阳系 B.地月系 C.银河系 D.河外星系

【2】Kepler 452b可能有液态水存在,说明它具有的重要条件是

A.质量体积适中 B.距中心天体远近适中

C.宇宙环境安全 D.中心天体的光热稳定

【答案】

【1】C

【2】B

【解析】

试题分析:

【1】读材料可知,开普勒452b,为一颗行星,和地球的相似指数为0.98,是至今为止发现的最接近地球的孪生星球,它距地球大约1400光年。它和地球一样是一颗行星,它不会位于地月系(地月系的中心天体为地球,由地球和月球组成),B错。太阳系由八大行星组成,不包含开普勒452b,A错。由它距离地球1400光年和银河系的直径可知,该行星位于银河系内,C对、D错。故选C。

【2】Kepler 452b可能有液态水存在,说明该行星距离其中心天体的距离适中,从而使得该行星有适宜的温度,水能够以液态的形式存在,故选B。

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