问 Ethan:为什么我们感觉不到宇宙的膨胀在加速?

宇宙不仅仅是在膨胀,而且膨胀本身也在加速。那么为什么我们无法以任何可测量的方式感受到它呢?继续阅读《从一声巨响开始!》»

来源:以一声巨响开始!
扩展的宇宙充满了星系和我们今天观察到的复杂结构,源于较小,更热,更密集,更均匀的状态。 Although the extent of the observable Universe, today, takes us out some 46 billion light-years in all directions, in the distant cosmic past, everything in space was much more compact, closer together, and occupied a much smaller volume, begging the question: what drives the expansion of the Universe, both initially, at the start of the hot Big Bang, and today, at late cosmic times, where the expansion is accelerating? (信用:C.-A。Faucher-Giguere,A。Lidz和L. Hernquist,Science,2008)
扩展的宇宙充满了星系和我们今天观察到的复杂结构,源于较小,更热,更密集,更均匀的状态。 Although the extent of the observable Universe, today, takes us out some 46 billion light-years in all directions, in the distant cosmic past, everything in space was much more compact, closer together, and occupied a much smaller volume, begging the question: what drives the expansion of the Universe, both initially, at the start of the hot Big Bang, and today, at late cosmic times, where the expansion is accelerating? 信用

问Ethan:为什么我们不觉得宇宙的扩展加速了?

宇宙不仅是扩展,而且扩展本身正在加速。那么,为什么我们不能以任何可衡量的方式感觉到它呢?

但是,在较大的宇宙尺度上,宇宙确实在扩展,而且这种扩展正在加速。为什么这种扩展是我们在地球上没有以任何方式体验到的东西,甚至无法在陆地实验中感觉到或发现我们最敏感的乐器?这就是吉姆想知道的,正如他写的那样:

“许多宇宙学家认为宇宙的扩展正在加速。如果是这样,我们为什么不觉得……