How are galaxy and star formation initated?
星系和恒星形成是如何开始的？
The conditions for forming the vast number of galaxies we see yet contain a large element of mystery. If the expanding universe were perfectly uniform in density, then there would be no net gravitational attraction to initiate the formation of galaxies. Yet the evidence indicates that it was largely "smooth". The irregularities in mass must have been very small and formed very early in the history of the universe.
形成我们所见的大量星系的条件仍包含大量谜团。如果膨胀的宇宙密度完全均匀，就不会有净的引力作用来引发星系的形成。然而证据表明，它总体上是‘平滑’的。质量的不规则性必须非常微小，并且在宇宙历史的早期就形成了。
| What conditions were necessary to form our Sun?
形成我们太阳的条件是什么？ |
索引
HyperPhysics  | R Nave |
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