What is Helium-3?
'''Helium-3''' ('''<sup>3</sup>He''') is a light, stable [[isotope]] of [[helium]]. It has two [[Proton|protons]] and one [[neutron]]. Helium-3 was discovered in 1939. Helium-3 occurs as a [[primordial nuclide]]. It escapes from the [[Earth's crust]] into the [[atmosphere]]. It then escape into [[outer space]] over millions of years. Helium-3 is also thought to be a natural [[Nucleogenic nuclide|nucleogenic]] and [[cosmogenic nuclide]]. The amount of helium-3 is thought to be greater on the [[Moon]] than on [[Earth]].<ref>{{Cite web|last=|first=|date=|title=Global inventory of Helium-3 in lunar regoliths estimated by a multi-channel microwave radiometer on the Chang-E 1 lunar satellite|url=http://lunarnetworks.blogspot.in/2010/12/change-1-maps-moons-helium-3-inventory.html|url-status=dead|archive-url=https://web.archive.org/web/20171011021507/http://lunarnetworks.blogspot.in/2010/12/change-1-maps-moons-helium-3-inventory.html|archive-date=2017-10-11|access-date=|website=}}</ref> ==References== {{Reflist}} {{Chemistry-stub}} [[Category:Isotopes]] [[Category:Helium]]