Nuclear energy is released by the splitting (fission) or merging together (fusion) of the nuclei of atom's). The conversion of nuclear mass to energy is consistent with the mass-energy equivalence formula ΔE = Δm.c ², in which ΔE = energy release.
Geothermal power is power extracted from heat stored in the earth. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. It has been used for bathing since Palaeolithic times and for space heating since ancient Roman times, but is now better known for generating electricity. Worldwide, geothermal plants have the capacity to generate about 10 gig watts of electricity as of 2007, and in practice supply 0.3% of global electricity demand.
Nuclear energy and geothermal energy both have heat in common because of the core in the middle of the sun is combined with all of the other atoms which split apart and nuclear and geothermal has a core in the middle of it.
They are both used heat to generate electricity, Because Nuclear energy is used to generate electricity by an atom with a very low fuel cost and much less pollution than fossil fuels; and Geothermal energy is generated by internal heat from the planet.
Nuclear power is power (generally electrical) produced from controlled nuclear reactions. Commercial plants in use to date use nuclear fission reactions. Electric utility reactors heat water to produce steam, which is then used to generate electricity. In 2009, 15% of the world's electricity came from nuclear power, despite concerns about safety and radioactive waste management. More than 150 naval vessels using nuclear propulsion have been built.
Nuclear fusion reactions are widely believed to be safer than fission and appear potentially viable, though technically quite difficult. Fusion power has been under intense theoretical and experimental investigation for many years.
Both fission and fusion appear promising for some space propulsion applications in the mid- to distant-future, using low thrust for long durations to achieve high mission velocities. Radioactive decay has been used on a relatively small scale, mostly to power space missions and experiments.
It has been used for bathing since Palaeolithic times and for space heating since ancient Roman times, but is now better known for generating electricity. Worldwide, geothermal plants have the capacity to generate about 10 gigawatts of electricity as of 2007, and in practice supply 0.3% of global electricity demand. An additional 28 gigawatts of direct geothermal heating capacity is installed for district heating, space heating, spas, industrial processes, desalination and agricultural applications.
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