The Black Hole

Contrary to the legend, a black hole is not a scary cosmic vacuum cleaner. It is a specific place of space in which anything can’t escape its pull, even light! An easy way to explain this fact is by knowing that a star is made of gas, and when its fuel exhausts, cannot any longer counteract the inward pull of gravity. Because of that, "the crushing weight of the star’s overlying layers implodes the core and the star digs deeper into the fabric of space-time. Then the star passes through its event horizon and disappears from our universe, forming a singularity of infinite density." In short, a black hole is what remains when a massive star dies, and as many speculators say, it also could be the pathways into other universes. (Source: http://www.pbs.org/)