Hydrogen nuclear fusion in stars, illustration

Numéro d’image : 12948811
Hydrogen nuclear fusion in stars, illustration
Hydrogen nuclear fusion in stars, illustration. The fusion process shown here (known as the proton-proton chain reaction) is the one that occurs in Sun-like stars that are fusing hydrogen and helium. At upper left, two protons (hydrogen nuclei, yellow spheres) fuse to form a nucleus of deuterium (an isotope of hydrogen, also known as hydrogen-2), as well as a neutrino and a positron (smaller particles). The deuterium nucleus consists of a proton (yellow) and a neutron (green). The second fusion reaction (middle) is a proton and a deuterium nucleus fusing to produce a helium-3 nucleus and gamma radiation (white wave symbol). The third fusion reaction (lower right) is two helium-3 nuclei fusing to form a helium-4 nucleus and two protons. Most of the fusion reactions in such stars are of hydrogen, with helium fusion typically occurring once the hydrogen in the star's core has been used up.
Licence : Droits gérés
Crédit: Science Photo Library / Hardy, David A.
Taille de l’image : 3631 px × 2890 px
Model Release : Non requis
Property Release : Non requis
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