History of Black Holes
When were black holes first predicted?
1916 (early 1900's)
What is a Black Hole?
A supermassive star.
Who created General Relativity?
Albert Einstein
Time travel is connected to ____.
Black Holes
What is the nearest black hole in Milky Way called?
Sagittarius A*
True
General Relativity can be proven from the solar system. True or False?
True, the sun warps space time and planets follow the path around the sun.
If someone were to approach a black hole(not enter it), what would happen around them?(Assuming you are viewing outside the hole).
Time would slow down for the approaching person, and they would possibly start to stretch if too close. (Spaghettification)
What will happen if objects get close to a black hole?
Spaghetification, matter would be stretched
What are accretion disks?
Accretion disks are rings formed by gas/dust that surrounding black holes.
What is General Relativity?
General Relativity is a space-time geometric theory that states concentrations of mass and energy curves the structure of space-time.
How long is 1 year in a black hole compared to Earth years?
1 year in black hole = 80 years on Earth
How are they formed?
When a star burns out its nuclear fuel, it causes a supernova explosion. If its mass is greater than the Sun by five times (about 9.9455e+30 kg), it collapses and forms a black hole.
What is Hawking radiation?
Hawking radiation is when particles in “empty space” pop in and out, and when this occurs near a black hole, it takes one of the pair. The other particle escapes by taking energy from the black hole.
How did GR predict the existence of black holes?
GR said mass/energy affect structure of spacetime and black holes does exactly that.
Explain how you can "time travel" in a black hole.
When you approach a black hole, time slows down because of its intense gravitational pull. So if you get nearer to a black hole, time will pass faster on Earth.