Question

What is Dark Matter? ...
What is Dark Energy? ...
What Came Before the Big Bang? ...
What's Inside a Black Hole? ... ​

Answer 1

Answer:

1,2-In short, dark matter slows down the expansion of the universe, while dark energy speeds it up. ... Meanwhile, dark energy is a repulsive force — a sort of anti-gravity — that drives the universe's ever-accelerating expansion.

3-It's possible that before the Big Bang, the universe was an infinite stretch of an ultrahot, dense material, persisting in a steady state until, for some reason, the Big Bang occured. This extra-dense universe may have been governed by quantum mechanics, the physics of the extremely small scale, Carroll said.

4-At the center of a black hole, it is often postulated there is something called a gravitational singularity, or singularity. This is where gravity and density are infinite and space-time extends into infinity. Just what the physics is like at this point in the black hole no-one can say for sure.

Explanation:

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Answer 2

• Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. ... Most dark matter is thought to be non-baryonic in nature; it may be composed of some as-yet-undiscovered subatomic particles.

• In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales.

• The Big Bounce theory was once thought impossible. But two physicists have just resurrected it. In the beginning, there was an infinitely dense, tiny ball of matter. Then, it all went bang, giving rise to the atoms, molecules, stars and galaxies we see today.

• HOST PADI BOYD: Around a black hole is a boundary called the event horizon. Anything that passes the event horizon is trapped within the black hole. But right as gas and dust get closer and closer to the event horizon, the gravity from the black hole makes them spin really fast … forming lots of radiation.