A bit of mould is a pleiad of flowers;a nebula is an ant-hill of stars.
菌是簇美不胜收的花朵，撮
云是无数天体的蚁聚。
云云状的系系;座;际的;;;
;
;;云
户座云；户云
状云云云A bit of mould is a pleiad of flowers;a nebula is an ant-hill of stars.
菌是簇美不胜收的花朵，撮云是无数天体的蚁聚。
You can see nebulae in the clear summer sky.
在晴朗的夏夜可以看到天上的云。
Extragalactic nebula is invisible to the naked eye.
我们用肉眼是看不到河外系的。
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物质块。这叫做原恒。
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