Stars are exploding two, three, and sometimes four times in the first minutes following the initial explosion, ... First comes a blast of gamma-rays followed by intense pulses of X-rays. The energies involved are much greater than anyone expected.  -   David Burrows     Quotes
Stars are exploding two, three, and sometimes four times in the first minutes following the initial explosion, ... First comes a blast of gamma-rays followed by intense pulses of X-rays. The energies involved are much greater than anyone expected. David Burrows