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free-fall
subjectfact 
free-fallhas definition 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.has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:29:54.0
is a kind of collapse2001-09-27 09:29:54.0
physical processhas domain physics2001-09-27 09:29:38.0