What are the only things we can tell about the nature of the material within a black hole?

Q: What is a black body? On what factors does the radiation emitted from it depend?

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Q: How can a black hole emit X-rays?

A: Black holes are regions of high gravity in spacetime.   Once a black hole is formed it will start…

Q: Now look at the two images labeled "At a distance of 2.5M" and "At a distance of 2.1M". These show…

A: The mass of the black hole is so massive that even light can’t escape from it. A black hole is a…

Q: Is the event horizon of a black hole the actual physical surface of the object?

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Q: The diagram shows the believed structure of a black hole if viewed from the top and in 3D. Calculate…

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Q: Why is a black hole invisible?

A: A black hole is a region in space where the pulling force of gravity is so strong that light is not…

Q: Why black holes are difficult to observe directly?

A: In supernova the collapse of massive stars core form a black hole. In space , a Black hole is a…

Q: Calculate the mass of a black hole at room temperature.

A: Black holes are regions of space-time where the gravity is very large that nothing, not even light…

Q: an introduction on what is the event horizon of a black holes?

A: The occasion horizon of a black hollow is a essential idea in astrophysics that marks the boundary…

Q: How large is the Schwarzschild radius of a black hole containing that of the Earth? a mass equal to

A: Schwarzschild radius is defined as the radius below which an object will collapse under its own…

Q: How can a black hole be massive but not big?

A: A blackhole is a region in space which have an extremely high gravitational field so that even light…

Q: The radius at which nothing can escape the pull of a black hole is called the ________.

A: The radius at which nothing can escape the pull of a black hole is called the Schwarzschild radius.

Q: What would you have to do to make earth a black hole ?

A: Black holes are objects in space from which even light can not escape. What makes the black hole so…

Q: What does a black hole sound like?

A: Black hole is a heavenly body.

Q: How likely is it for a black hole to collide with Earth? Would we have much warning?

A: In space-time curvature, black holes are the region where the gravity is so strong that nothing even…

Q: A black hole has a Schwarzschild radius of 25 km. How much mass is contained in the black hole?

A: Schwarzschild radius is defined as the radius below which an object will collapse under its own…

Q: If the sun has a Schwarzschild radius, why isn't it a black hole?

A: Every object with a mass has a minimum size to which it can shrink before it undergoes irreversible…

Q: How would it appear to an outside observer if someone were to enter a black hole?

A: General Relativity gives us a way to describe the universe that is independent of any frame of…

Q: calculate the Schwarzschild radius of a black hole with a mass 20 times the mass of the Sun.

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Q: What indicates that the gravitational wave originated from the merger of a black hole?

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Q: What is the Schwarzschild radius (in km) of a 20 solar mass black hole?

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Q: What evidence can you cite that black holes really exist?

A: Black holes are regions of high gravity in spacetime. They are so strong that even light cannot…