Black Holes
While singularities are difficult to define and to prove, black holes are not. Black holes are areas with such extreme gravitational pull that the velocity an object would need to escape them is greater than the speed of light, and, thus, unattainable. Bl.ack holes are observable and have been proven to exist. They may be created when a star collapses, though this is also a theory.
Infinite Density
Because the gravitational pull of a black hole is immense, objects cannot escape from it. Moreover, as the objects approach the event horizon of the black hole, the gravity becomes more and more intense, so that, eventually objects are unable to escape. This means that the black hole continues to engulf matter. Furthermore, the intense gravity that exists in a black hole means that this matter is all compressed into a tiny spot.
Expansion
At some point in time, for reasons unknown, the singularity released a tremendous amount of power.
Initial Expansion
The initial speed of expansion was well beyond the speed of light. "The theory maintains that, in the instant -- a trillion-trillionth of a second -- after the big bang, the universe expanded with incomprehensible speed from its pebble-size origin to astronomical scope" (National Geographic). The expansion has slowed from its initial speeds.
Current Expansion
While expansion has slowed, the universe continues to expand. In fact, observations of this expansion are what led to the formation of the Big Bang Theory. Of particular interest is Hubble's Law, which is that galaxies are moving away from us at speeds that are proportionate to their distance; in other words, the farther away they are, the slower they are moving away. This suggests that expansion is continuing to...
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