physics energy from the nucleus

1. chain reaction
2. fissionable isotopes, u235 and u238
3. energy is givern out

1. energy is brounght in
   1. suns core releases energy
   2. heavy hydrogen

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1. prostar
   1. main sequence star
      1. high mass
         1. red super giant
            1. supernova
               1. black hole or neutron star
      2. low mass
         1. white dwarf
            1. black dwarf

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