nebulae

Extragalactic nebula is invisible to the naked eye.

我们用肉眼是看不到河外系的。

You can see nebulae in the clear summer sky.

晴朗的夏夜可以看到天上的。

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

霉菌是簇美不胜收的花朵，撮是无数天体的蚁聚。

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

蓝色附近，微但迷人的微黄色弧状可见物标出了年轻可见恒南冕座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.

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