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).
The existence of dark energy is inferred from the apparent acceleration in the universe's expansion, and also from observed irregularities in the cosmic background radiation that many attribute to effects from a hypothesized Big Bang.n exact definition of dark energy has eluded scientists. One description is that it is like gravity, but is repulsive (outward-pushing) rather than attractive (inward-pulling), and operates over a much larger scale than conventional gravity.