Past this imaginay line, the gravity is so strong even light cannot escape.
What is the event horizon?
The 4'th dimension in spacetime
What is time?
The name of the black hole at the center of our universe
What is Sagittarius A?
Black holes might be gateways to other universes or points in space if this exists?
Wormholes
What is the opposite of a black hole?
The infinitely dense point of a black hole
What is the singularity?
The minimum mass in order for spacetime to bend around an object
What is none?
The most well-known ultramassive black hole
What is TON 618?
Can time travel theoretically be possible through using black holes (and how)?
Black holes bend spacetime. Since travel in the 4'th dimension (time) could be similar to travel in the other dimensions under certain conditions, it is theoretically possible.
What hypothetical object would be proved if going inside a black hole leads to going out of a white hold in another universe?
Wormhole
A disc of superheated gas and dust whirling around a black hole
What is an accretion disk?
A large pulsar can cause more spacetime bend than a smallblack hole (T or F)
What is false
One of the first black holes discovered
What is Cygnus X-1?
Regular matter
If white holes are the opposite of black holes, are they infinitely dense, or do they have no density (and why)?
Infinitely Dense