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: For a '''fusion''' [[Nuclear Reaction|reaction]] to occur the two [[Atomic Nucleus|nuclei]] must have enough [[Kinetic Energy Store|kinetic energy]] to overcome the [[Electrostatic Force|electrostatic force]] of repulsion between the [[Positive Charge|positively charged]] [[Atomic Nucleus|nuclei]].
: To provide enough [[Kinetic Energy Store|kinetic energy]] to the [[Atomic Nuclei|nuclei]] the [[substance]] must be [[heat]]ed to a [[temperature]] of several million [[Degrees Celsius|degrees Celsius]].
: '''Nuclear fusion''' occurs naturally in the centre of a [[Star]] due to the high [[temperature]]s and [[pressure]].
: '''Nuclear fusion''' is possible in [[laboratory|laboratories]] on [[Earth]] but it cannot be sustained for long periods of [[time]] to produce enough [[energy]] to be useful as an [[Energy Resource|energy resource]].
: '''Nuclear fusion''' in [[laboratory|laboratories]] on [[Earth]] must be done at much higher [[temperature]] than in the centre of [[Star]]s because the centre of [[Star]]s is a much higher [[pressure]] so [[Atomic Nucleus|nuclei]] collide more often.