density of a black hole?

Question

i read in a book that the denssity of a black hole is 100000000000000000000000000000000000000000000000000000000000000000000000000000000 tons per cubic in. of 1E^80 tons per cubic in. is it true? i thought that you could not mesure that because nothing could get close enough to test it without being destroyed.

Answer 1

A black hole is a space-time singularity; therefore it has an infinite mass density.

Answer 2

No one has ever measured the density of a black hole, but it is possible to measure its mass. The mass can be determined from the orbits of the stars near the black hole.

The original, classical solution to Einstein's equations of General Relativity by Karl Schwarzshid has only empty space with an infinitely dense singularity in the center. (This singularity is also located infinitely far in the future.) Inside the black hole, however, we have no way of knowing what the density distribution actually is---any spherical distribution of mass inside the event horizon has exactly the same solution outside. Eventually, all the mass inside the event horizon will be crushed to a point, but seen from the outside, this takes an infinitely long time. So it is possible that the density inside the event horizon is uniform---in other words, that the mass inside is spread out evenly over the internal volume. If the black hole is large, this average density could be quite small. The average density can be made as small as you like, by making the black hole sufficiently massive.

Answer 3

a black whole has density same to that of sun but its radius is 500 times more than of the sun. due to its large radius and density its escape velocity becomes equal to the speed of light ans thus even light can't pass through the black hole and its invisible.

If the semi-diameter of a sphere of the same density as the Sun were to exceed that of the Sun in the proportion of 500 to 1, a body falling from an infinite height towards it would have acquired at its surface greater velocity than that of light, and consequently supposing light to be attracted by the same force in proportion to its vis inertiae (inertial mass), with other bodies, all light emitted from such a body would be made to return towards it by its own proper gravity.

Answer 4

Hi. The density of a black hole is determined by measuring its mass. This mass will have a particular radius of the event horizon. The rest is math.

Answer 5

It is just an estimate. Because there are equations from which they can find out the density for which a star collapses into a black hole.

Answer 6

We can in a way measure it. The black hole is in the center of all galaxies and it has enough gravity to hold millions of solar systems in orbit measuring several light years in diameter. that is real force ,what u think.

Answer 7

Using math scientists make their best guess. Also each one is different, they don't all have the same density.

Answer 8

complex problem. do a search with yahoo. that can assist!

Answer 9

its as dense as your ars e