香港服务器129.226.50需不需要备案游戏
香港服务器哈勃常数与宇宙年龄之间的关系是什么？129.226.50.1为什么哈勃常数越大，宇宙越年轻？
宇宙正在膨胀，宇宙的大小一直是不同的。我们把宇宙的大小记录为a(t)函数。应该注意到，宇宙的膨胀速度并不均匀-宇宙最初是在大约50亿年前减速和膨胀的。也就是说，a(t)to time的导数不是常数。
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香港服务器为了描述这个过程，我们定义了哈勃参数H(t)：
在这个定义中，分母是宇宙的大小，分子是时间的导数。当t≤0(即我们所处的时刻)时，哈勃参数的值就是哈勃常数。
从大爆炸到现在的a(t)积分，你可以得到宇宙的年龄。从积分的结果可以看出，哈勃常数越大，宇宙的年龄就越小。
香港服务器哈勃常数越老，宇宙就越年轻，物理上就越直观。因为哈勃常数给出了宇宙膨胀的速率，所以宇宙越大，宇宙膨胀的速度就越快，所以宇宙膨胀到现在的规模所需的时间就越短。
引力透镜
从哈勃参数的定义可以看出，要获得哈勃常数，就必须测量宇宙的大小(也就是空间距离)。但在天文学中，只能测量红移，而不能测量距离。因此，天文学家的主要任务之一是建立红移与距离之间的函数关系，这与分析化学中常用的标香港服务器准曲线相似。利用这条曲线，宇宙中的恒星之间的距离可以通过红移来确定。
InhJee等人在他们的最新研究中，使用引力透镜绘制"标准曲线"。
香港服务器1919年爱因斯坦创立广义相对论后，爱丁顿的日全食实验证明了引力可以弯曲光。因此，特定的引力场可以看作透镜。在宇宙中，一些大质量的星系可以被视为透镜系统。
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