盘点哈勃望远镜12项重大太空发现(组图)(12)

宇宙的年龄
哈勃天文望远镜的观测结果使宇航员能够通过两种方法精确地计算出宇宙的年龄,第一种方法是依赖测量宇宙膨胀的比率,结果显示宇宙的年龄大概是130亿年;第二种方法是通过测量叫做白矮星的年老昏暗恒星所释放出的光线,该方法证实宇宙存在至少120-130亿光年。
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