Black Hole

It's, of course, a black hole! Black holes are extremely dense areas of spacetime that not even light can escape the gravitational pull. Einstein's theory of general relativity predicts that any mass with sufficient density can form a black hole. The boundary around a black hole (from where you can't escape) is called an event horizon. Black holes come in various types: Stellar black holes are black holes formed when stars collapse and are the smallest variety, Supermassive black holes are the biggest and lay at the center of most galaxies. Also, when black holes' gravitational pulls entangle each other, they form a Binary System, in which they can merge, however this disproves scientific theories. Because when they get closer, they should lose orbital energy but that requires them to lose mass (and they do via hawking radiation) however, as the orbits shrink, so does the area subject to this effect. So when their distance is roughly around one parsec there is so little matter left between them that it would take billions of years for them to successfully merge (longer than the age of the universe). Although, supermassive black holes have properly merged, which creates 'The Final Parsec' problem. Hope you enjoyed that long explanation and hope you like the design! ;)