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physical phenomena > process > physical process > motion > mass motion > contraction > collapse

collapse
subject			fact

collapse	has definition Sudden contraction of a celestial body
	is a kind of contraction
physical process	has domain physics

Kinds of collapse :

• axisymmetric collapse (3 facts) - Collapse of mass in such a way that the mass maintains the symmetry of a cylinder.
• free-fall (2 facts) - 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.
• gravitational collapse (1 kind, 3 facts) - The sudden collapse of a massive star when the radiation pressure outward is no longer sufficient to balance the gravitational pressure inward. In gravitational collapse there is a sudden, catastrophic release of great quantities of gravitational potential energy, and this release has been postulated as the cause of supernovae, neutron stars, and black holes.
• spherical collapse (4 facts) - Initial stage in the collapse of a star, followed by gravitational collapse and finally singularity.