انشطار نووي
[[Nuclear fission]] reactors are a natural energy phenomenon, having naturally formed on earth in times past, for example a [[natural nuclear fission reactor]] which ran for thousands of years in present-day Oklo [[Gabon]] was discovered in the 1970s. It ran for a few hundred thousand years, averaging 100 [[Watt#Kilowatt|kW]] of thermal power during that time.