nebula,cluster,globular cluster,galaxy,supercluster哪个范围大,定义是什么?特点~

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nebula,cluster,globular cluster,galaxy,supercluster哪个范围大,定义是什么?特点~
nebula,cluster,globular cluster,galaxy,supercluster哪个范围大,定义是什么?特点~

nebula,cluster,globular cluster,galaxy,supercluster哪个范围大,定义是什么?特点~
nebula:a cloud of gas or dust in space
cluster:a group of similar things that are close together, sometimes surrounding something
globular cluster:old stars in the outer regions of a galaxy
galaxy:one of the independent groups of stars in the universe
supercluster:large groups of smaller galaxy groups and clusters

superclustercx

球状星团(Globular cluster):在星系galaxy):活动的椭圆星系,它的大部分超星系团(Supercluster):数千个星系目前天文观测范围已经扩展到200亿光年