CAROL & MIKE WERNER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY CAROL & MIKE WERNER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY
Illustration of Helium3 (He-3), a non-radioactive isotope of helium with two protons and one neutron. It is useful for nuclear fusion research. He-3 is rare on earth but thought to be more abundant on the moon. The use of He-3 as an energy source has renewed interest in mining the moon's resources. Key: red=proton, blue=neutron, cyan=electron.
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