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| physical phenomena > process > physical process > motion > mass motion > contraction > collapse > free-fall | 
| free-fall comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| collapse | contraction | Sudden contraction of a celestial body | 
| free-fall | collapse | A collapse in which gas clouds do not hit or impede one another. According to ELS, the Galactic halo formed in a free-fall collapse. | 
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