A bit of mould is a pleiad of flowers;a nebula is an ant-hill of stars.

一粒霉菌是一簇美不胜收的花朵，一撮云是无数天体的蚁聚。

You can see nebulae in the clear summer sky.

在晴朗的夏夜以看到天上的云。

Extragalactic nebula is invisible to the naked eye.

我们用肉眼是看不到河的。

The tiny but intriguing yellowish arc visible near the blue nebulae marks young variable star R Coronae Australis.

在蓝色云附近，微但迷人的微黄色弧状标出了年轻恒南冕座R的位置。

As our nebula began to collapse under its own gravity and spin faster, a dense clump of matter formed in the center. It's called a protostar.

当我们的云在自身重力作用下崩溃和更加快速地旋转时，云中心形成了密集的质块。这叫做原恒。