Editing Protogalaxy (section)

===Luminosity===
The luminosity of protogalaxies comes from two sources. First and foremost is the [[radiation]] from nuclear fusion of Hydrogen into [[helium]] in early stars. This early burst of star formation is thought to have made a protogalaxy's luminosity comparable to a present-day [[starburst galaxy]] or a [[quasar]]. The other is the release of excess [[gravitational binding energy]].<ref name="EAAV3" />
The primary wavelength expected from a protogalaxy is a variety of [[Ultraviolet|UV]] called [[Lyman-alpha]], which is the wavelength emitted by Hydrogen gas when it is [[ionised]] by radiation from a star.<ref name="EAAV3" /><ref name=PGTCDM/>