In this video the JK experts remove the engine bolts from a Volkswagen in preparation to for removal of the engine.
Dark matter. Written By: Dark matter, a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 26.5 percent of the matter-energy composition of the universe; the rest is dark energy (73 percent) and âordinaryâ visible matter (0.5 percent).
Hot dark matter is a form of dark matter which consists of particles that travel with ultrarelativistic velocities.ue to theory, in order to explain small scale structure in the Universe, it is necessary to invoke cold dark matter (CDM) or warm dark matter. Hot dark matter as the sole explanation of dark matter is no longer viable, therefore, it is nowadays considered only as part of a Mixed dark matter theory.