Does all the mass of a core collapsing star get scattered during a supernova explosion? If it does, then how can a black hole be formed without any remaining mass? Or are there remnants of the star after supernova which would become a black hole?
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There are several types of supernova, some leave a remnant, either a neutron star or black hole, some just blow the star apart. Neutron stars do not explode. – PM 2Ring Jan 15 '19 at 15:18
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BTW, @DanYand another type that can leave no remnant is the pair instability supernova. – PM 2Ring Jan 15 '19 at 15:39
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2please read this https://en.wikipedia.org/wiki/Supernova#Core_collapse – anna v Jan 15 '19 at 16:54
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1Related: https://physics.stackexchange.com/q/407854/2451 and links threrein. – Qmechanic Jan 15 '19 at 18:33