神马作文网nebula,cluster,globular cluster,galaxy,supercluster哪个范围大,定义是
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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
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