地球的姊妹星  

Sister Earth

作　　者：霍立林[1] 

机构地区：[1]北京师范大学

出　　处：《大学英语》2007年第9期4-6,共3页College English

摘　　要：假如地球外有生命存在。它就需要一个能使其进化的星球。在天文学家至今发现的200颗左右太阳系外行星中只有一个适合。这是因为这些行星都由气体组成。而本周宣称发现的这颗行星却不一样。天文学家认为它像地球一样由岩石构成，而且可能有液态水。这就使它最有希望维持生命。If extraterrestrial1 life were to exist, it would need a planet on which to evolve. All but2 one of 200-or-so planets outside the solar system that have so far been discovered by astronomers would be quite unsuitable. That is because they are composed of gas. Yet the one whose discovery was announced this week is different. Astronomers think it is rocky,

关 键 词：地球 生命存在 天文学家 行星 太阳系 液态水 岩石 

分 类 号：P183[天文地球—天文学]