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哈雷彗星，一個太陽系家族調(diào)皮的小精靈。它每隔76年回歸以此地球，是在地球上唯一一顆能用裸眼觀測到的彗星。哈雷彗星上一次造訪地球要追溯到1986年，而下一次回歸地球要到2061年。哈雷彗星，一個浪漫的約定，
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浩瀚星空，繁星點點，前有古人夜觀天象，暢想嫦娥奔月；今有人造衛(wèi)星升空，探索無盡蒼穹，人類探索宇宙的步伐從未停止，于是便從地球，到月球，再到太陽系..小編為大家?guī)戆舜笮行堑慕榻B
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聽寫填空,只寫填空內(nèi)容,不抄全文,5個左右的句子,不用寫標號,注意標點~ Hints: Kepler Cygnus Lyra Earth-like Alan Boss: I think we're on the verge of finding out just how many Earth-like planets...
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450)this.width=450" 聽寫填空,只寫填空內(nèi)容,不抄全文,5個左右的句子,不用寫標號,注意標點~ Hints: Kepler Cygnus Lyra Earth-like Alan Boss: I think we're on the verge of finding out jus
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聽寫填空,只寫填空內(nèi)容,不抄全文,3-5個句子,不用寫標號,注意標點~ Hints: Cygnus Lyra Alan Boss: I think we're on the verge of finding out just how many Earth-like planets there are in the unive...
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Popular accounts of the Large Hadron Collider often say it’s trying to ___1___ the conditions at the Big Bang. “One of the things that’s different is this is a much simpler situation, right? ...
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Five very old galaxies are now known to astrophysicists, thanks to Albert Einstein. A century ago, Einstein predicted an effect called cosmic gravitational lensing. Picture a massive galaxy out i...
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