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大家在搜：碳序天测双星团星驼峰造父变星椭球变星太阳型星太阳向点太阳背点速逃星速度椭球

坍缩云

网络collapsing cloud

坍缩云

坍缩云

1

坍缩的星际云克服向内的引力而向外膨胀到较宁静的星际环境中去。

Collapsing interstellar cloud reverses its gravitational infall and expands outward into the relatively quiescent interstellar environment .

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