• A number of reactions take place in the sun that cannot be duplicated on Earth.
  • Some of these reactions involve the formation of large elements from smaller ones.
  • If such a reaction could be accomplished efficiently on Earth, it could provide a clean source of nuclear energy.
  • Unlike fission reactions, nuclear fusion does not produce radioactive products that represent hazards to living systems.
  • Extremely high temperatures (in the millions of degrees) are required.
  • Methods must be developed to force the atoms together and hold them together long enough to react.
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