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2011-07-29
一直以來,我們只知道地球有一個衛星月球,伴着地球旋轉,但加拿大科學家去年發現,原來地球一直另有一個忠誠小同伴─一顆直徑 275米的小行星,一直伴隨着地球圍繞太陽公轉。
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2011-06-21
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2011-06-17
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2011-06-09
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2011-06-02
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2011-04-17
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2011-04-03
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2011-04-01
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2011-03-08
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2011-02-23
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2011-02-22
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2011-02-15
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2011-01-16
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2011-01-15
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2010-11-16
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2010-08-26
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2010-08-19
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2010-08-08
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2010-08-06
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2010-08-06