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physical phenomena > process > physical process > motion > mass motion > contraction > collapse > gravitational collapse > supernova explosion
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Subject is a kind of has definition
gravitational collapsecollapseThe 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.
supernova explosiongravitational collapse 

Upgravitational collapse