Hydrogen burning The conversion of nuclei of hydrogen into nuclei of helium and the release of large amounts of energy. Hydrogen burning is the process by which the Sun and other main sequence stars obtain their energy. Hydrogen burning, like other kinds of nuclear burning , requires extremes in temperature and density. The gaseous and dusty matter present in the space between a galaxy's stars . Ion An atom that has lost one or more electrons .
Ions have a positive electric charge.
The simplest ion is the nucleus of a hydrogen atom, which is a proton . A star that derives its energy from the conversion of hydrogen into helium in its core. The Sun is a main sequence star. Mass The quantity of matter in an object, usually expressed in kilograms or pounds. An elementary particle with zero electric charge and very little mass .