WeLLrightyOH t1_iwxwrco wrote
Reply to comment by paulfromatlanta in Dark Matter as an Intergalactic Heat Source. Spectra from quasars suggest that intergalactic gas may have been heated by a form of dark matter called dark photons. by MistWeaver80
Photons are wave/particles. They are not ordinary matter (most think of ordinary matter as items made up of atomic nuclei). Photons have zero mass as they do not interact with the Higgs field. Photons do have energy which is inversely related to it’s wavelength. Most visible light is about 2 eV. Photons aren’t energy per se, but they do have energy.
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