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Old 01-26-2019, 04:11 PM   #4670 (permalink)
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I went back through the workbook which accompanied the DVD astronomy course.
At end of life,massive stars become gravitationally unstable,experience a core collapse,blow away their outer plasma layers in an enormous release of energy.
Core remnants will be either a neutron star or black hole.
All pulsars are formed this way.
These events are irreversible.
Repeating 'nova' from the same source are impossible.
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