1. Black Holes
... . It is a region where matter collapses due to the heat and pressure supplied by the fusion of the material within the object. In a star, for example, if the fusion of the material within it is less than the gravitational pull inward, the star will collapse, and if it is massive enough, ... 's event horizon appears black because the gravity is so strong that the escape velocity equals the speed of light. There is no satisfactory theory for what happens at and beyond the singularity; Time and space no longer have any meaning and cease to exist as we know them. If it ... is impossible to s...
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