Astronomy

Black holes are the ends of starsw that are at least ten to fifteen times as massive as the Sun! If a star that is that big goes through a supernova explosion, it is possible that it will leave behind a rather large burned out stellar remains. Without any kind of outside forces to go against the gravitational forces, the remains will collapse on itself. Eventually the star will collapse to zero volume and infinite density. As the density increases, the path of the light rays that come from the star are bent and are wrapped to a point where they cannot be unwrapped. The star is called a Black Hole because no light escapes after the star reaches this infinite density.

Worm holes are supposedly short cuts through space.