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

Next collapse: gravitational collapse    Up: collapse    Previous collapse: axisymmetric collapse