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The abundance ratio was about seven protons for every neutron.Before one neutron half-life passed nearly every neutron had paired up with a proton, and nearly every one of these pairs had paired up to form helium.
The idea that stars fuse together the atoms of light elements was first proposed in the 1920s, by Einstein's strong supporter Arthur Eddington.
with a sprinkling of deuterium, a dash of helium-3, and a trace of lithium-7. The atoms in your body – apart from the hydrogen – were all made in stars … Stars on the main sequence get the energy they shine by from nuclear reactions in their cores; off the main sequence, the energy comes from nuclear reactions in a shell (or more than one shell) around the core.
There are several different nuclear reaction cycles, or processes (e.g.
More than ninety per cent of the universe is composed of hydrogen and helium.
Both elements have been around since shortly after the beginning of the universe.