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It depends how big it is. First Scientist's compare it to the sun, VY Canis Majoris, or something they already have the dimensions to. Possibly by km. or miles.

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Q: What do use to measure a black hole?
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How can the mass of a black hole can be measured?

The mass of a black hole can be measure by the effects of its gravity on surrounding objects.


How do you make a black hole for a science fair project?

You can't really "make" a black hole, but you can do research, present on the research and do a small demonstration of one of the properties of a black hole. For example, there are lots of experiments you can set up to measure the force of attraction between two objects. You can use that as a launch pad, then compare that to the estimate gravitational force of a black hole.


How can you use black hole in a science?

There's no use for a black hole since even light cannot escape it.


Who discovered the black hole or how was the black hole discovered?

Your use of "the" black hole seems to indicate that you are thinking about one specific black hole. Please clarify which one - there are several known black holes, discovered at different times.


How can you use an black hole use in everyday life?

You can't.


How do astronomers measure the mass of a supermassive black hole?

By observing the movement of nearby objects. The gravity of the black hole will accelerate such an object according to Newton's Second Law (F=ma). More specifically, the details of the orbit of a star that moves around the black hole will vary, depending on the black hole's mass.


How do you weigh a black hole?

Black holes aren't a measure of matter. They are immense forces of gravity so strong not even light can escape it (I.e the name BLACK hole). So, while you cannot technically measure a black holes weight you could hypotheticallly measure it's denisity by measuring it's gravitational pull on an object and rationalize that with it's mass. Cha cha on!


A collapsed star from which light cannot escape?

The collapses star gets squeezed by collapses gas and turns into a black hole.


How do you get rid of a swimming pool in Scribblenauts?

You can use a black hole


What would happen if you jumped into a Kerr black hole?

If you jumped into an "ordinary" Schwarzschild black hole, you would be crushed into a long line of particles, which means death by a black hole. If you jumped into a Kerr black hole, the same process may occur, but the only thing different is that a Kerr black hole spins, and a Schwarzschild black hole does not. That answer needs a bit more detail. Please use the "related link" below.


What is the difference between a Scchwarzschild and a Kerr black hole?

A Schwarzschild black hole is a non-rotating black hole. The Kerr black hole is a rotating black hole. Since the latter is more complicated to describe, it was developed much later.A Schwarzschild black hole is a non-rotating black hole. The Kerr black hole is a rotating black hole. Since the latter is more complicated to describe, it was developed much later.A Schwarzschild black hole is a non-rotating black hole. The Kerr black hole is a rotating black hole. Since the latter is more complicated to describe, it was developed much later.A Schwarzschild black hole is a non-rotating black hole. The Kerr black hole is a rotating black hole. Since the latter is more complicated to describe, it was developed much later.


What is the age of the average black hole?

Unless scientists were to detect the gamma-ray burst that might herald the birth of a new black hole, there is not even a theoretical way to measure the age of a black hole. So the answer to this question, like so many questions in astrophsyics these days, is "We don't know".