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Gamma ray is a type of radiation that has no mass & no charge. Gamma rays have a high penetrating power. Text us. Tags: gamma ray, radiation, mass. Wednesday, February 01 2012.
There is however one particle that has been regarded as a candidate for dark matter: the elusive neutrino. Neutrinos have no electric charge, and hardly interact at all with ordinary atoms: almost all neutrinos that hit the Earth go straight through it.