The perfect nightmare might be the black hole. Nothing can escape from the proximity of a black hole, not even electromagnetic radiation can escape its wrath. The horizon, a spherical boundary, surrounds the entire black hole. The reason this is called a black hole is because it even sucks in light without allowing it to escape, and the absence of light is black. The concept of a black hole was formed from Einstein's theory of relativity and developed by and astronomer from Germany named Karl Schwarzschild in 1916.

Black holes form from exhausted stars. When nuclear fuels are exhausted in its core, there is no more heat to resist the core's contraction. If the core goes beyond 1.7 solar masses, neutron pressure or electron pressure cannot prevent collapse to a black hole. These two kinds of pressure can form a white dwarf or a neutron star.

A black hole weighing a few thousand million metric tons or more may remain in space. It's hard to get rid of a black hole. Try not to get stuck in one.