This is an object with gravity so strong that nothing--not even light--can escape from it.
What is a black hole?
100
Using this person's Theory of General Relativity, Karl Schwarzschild postulated the existence of black holes.
Who is Albert Einstein?
100
This is the number of basic kinds of black hole solutions to Einstein's equations.
What is four?
100
Stellar-mass black holes can be formed after this kind of object becomes a supernovae.
What is a star, or massive star?
100
This is the stellar-mass black hole with a mass which is 12 times that of the sun and which is at a distance of 8,000 light years from the solar system.
What is V404 Cygni?
200
A black hole is black because it neither reflects nor emits this.
What is light?
200
According to Karl Schwarzschild, in a black hole all matter is concentrated at this.
What is a point, a mathematical point, or a singularity?
200
This kind of black hole is spherical and does not rotate.
What is a Schwarzschild black hole?
200
There is believed to be a black hole in the center of this galaxy, and the black hole has a mass equal to that of nearly 3 million suns.
What is the Milky Way galaxy?
200
This is the mass (in solar units) of the black hole called Milky Way SgrA*.
What is 3,000,000 solar units?
300
This is the escape speed of the earth.
What is 11.2 kilometers/second?
300
Using Newton's Laws of Motion and Gravity, this French mathematician first imagined the existence of black holes in 1798.
Who is Laplace, or Pierre Laplace?
300
This kind of black hole can have a mass which is much, much smaller than that of a proton.
What is a Plank-mass black hole?
300
Black holes are believed to be able to evaporate through this process.
What is Hawking Radiation?
300
This supermassive black hole has a mass 3,000,000,000 times that of the sun.
What is Messier-87?
400
A black hole is defined as an object which has an escape speed greater than this.
What is the speed of light, or 300,000 kilometers/second?
400
This is the year in which Albert Einstein completed his Theory of General Relativity.
What is 1915?
400
This kind of non-rotating black hole has mass and charge.
What is a Reissner-Nordstrom black hole?
400
This is the mass of the sun.
What is 1.9 x 10^30 kilograms?
400
These two intermediate-mass black holes both have masses about seven times that of the sun.
What are Nova Oph 1977 and V4641 Sgr?
500
Because Schwarzschild black holes are so compact, exact, and beautiful, this is what mathematics call Schwarzschild black holes.
What is elegant?
500
This theory, which was developed by Albert Einstein, discusses the behavior of matter and light in the presence of large gravitational fields.
What is the Theory of General Relativity?
500
This kind of black hole has mass and charge and rotates.
What is a Kerr-Nordstrom black hole?
500
There are no known ways to create a black hole with a mass smaller than 1/10 that of this object.
What is the sun?
500
It takes light 2,700 years to reach the solar system from this black hole.