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Helium-3 (He-3) is an isotope of Helium with two protons and one neutron, which is rare on Earth; it is sought after for use in nuclear fusion research. More abundant helium-3 is thought to exist on the Moon (embedded in the upper layer of regolith by the solar wind over billions of years) and the solar system's gas giants (left over from the original solar nebula), although still in low quantities (28 ppm of lunar regolith is helium-4 and 0.01 ppm is helium-3).[1] It is proposed to be used as a second-generation fusion power source.