Academic [[physicist]]s feel that most of the [[mass]] in a [[galaxy]] is unseen dark matter, and that known substances like [[neutrino]]s, [[black holes]], and dead [[star]]s are insufficient. Many physicists believe that the dark matter is some as-yet-undiscovered subatomic particle, such as the axion, Higgs, or lightest supersymmetric particle. | Academic [[physicist]]s feel that most of the [[mass]] in a [[galaxy]] is unseen dark matter, and that known substances like [[neutrino]]s, [[black holes]], and dead [[star]]s are insufficient. Many physicists believe that the dark matter is some as-yet-undiscovered subatomic particle, such as the axion, Higgs, or lightest supersymmetric particle. |