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本期内容：
Astronomers discovered seven planets, roughly Earth-sized, orbiting a dwarf star some 380trn kilometers from our own. That is 40 light years away—fairly close and within range of planned big telescopes. Scientists therefore think it offers the best chance yet to discover evidence of life, or why it hasn’t evolved, beyond the solar system.
astronomer: 天文学家
roughly：大约的
orbit: 以……为轨道
dwarf star：白矮星
evolve: 进化
solar system：太阳系
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