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Because fission only requires that a fissile material (like U235 or Pu239) be struck by a particle to break, when it breaks, its broken pieces will go and break other particles and it will continue all on its own.

Fusion requires extremely high pressure and temperature to maintain, in order to force atoms together. When the material suddenly begins fusion, there is a massive release of energy which causes a large, sudden increase of pressure that the reactor needs to be able to hold without letting the reaction run away (since the sudden increase in pressure can cause a sudden increase in material fusion).

But the simple answer is, there are no conditions on Earth that allow for fusion, so we have to make them to force it. With fission, it can occur naturally and we just have to put it together and let it do its thing.

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14y ago

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