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).
This dark matter is almost as elusive as the dark energy, but we do have some clues to what it may be as it reveals itself by indirect means through gravitational influences on normal matter. The current thinking is that it may come down to one of two types of dark matter: hot or cold. Hot Dark Matter (HDM): This is matter that moves at or near relativistic speeds and therefore possesses high energy. 2  Because of this property it is more likely to be evenly distributed about the universe and less likely to clump together to form large structures like galaxies during the evolution of the universe.