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十大最荒诞科技谣言：外太空没有地心引力？(8)

2010-08-09 09:10:27 【大 中 小】

十大最荒诞科技谣言：外太空没有地心引力？

谣言八：北极星是北半球最亮的星

    这可算得上是一个全民误解。事实上，位于北半球的天狼星就比北极星亮，它的视星等是－1.47，而北极星的则是1．97，视星等越小的星星就越明亮。（编者注：视星等是天文学上用以划分天体明亮程度的单位之一。

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地心引力
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