An Etymological Dictionary of Astronomy and Astrophysics
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The reaction that transforms a → proton into a → neutron when a proton and an → electron are forced together to make a neutron: p + e^-→ n + ν^__e. In astronomy, this process occurs during the → core collapse of → massive stars which leads to the formation of → neutron stars.

→ neutron; → -ize; → -tion.