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Yes and No - While the current measure for the mass of a black hole is based on an indirect measuring of the speed of the orbiting material, there is no direct measuring of the density of a black hole.
Density is a concept involving mass divided by volume. While one can abstract the mass of a black hole, measuring the volume is a little tricky. We know there is a boundary at the Schwarzschild radius (Schwarzschild horizon) and this is also called the event horizon. Bascially, anything that happens beyond that point is unknown to us. Supermassive black holes have properties which distinguish them from lower-mass classifications. First, the average density of a supermassive black hole (defined as the mass of the black hole divided by the volume within its Schwarzschild radius) can be less than the density of water in the case of some supermassive black holes. This is because the Schwarzschild radius is directly proportional to mass, while density is inversely proportional to the volume. Since the volume of a spherical object (such as the event horizon of a non-rotating black hole) is directly proportional to the cube of the radius, the density of a black hole is inversely proportional to the square of the mass, and thus higher mass black holes have lower average density.
To complicate things even more, space-time is highly distorted around a black hole, so even asking how big it is, adds further complexity to this answer. Nonetheless, black holes have a mass and size. However one can not know if the mass inside is accreted all at one point or more spread out and distibuted. It appears the inner dynamics of the black hole provide for a plasma like accretion disk, which that pretty much changes (or distorts) our traditional dimensional frame of reference. It could be that the black hole merely suspends acquire mass in a medium of energy state. Consequently this medium of energy may preclude its growth or shrinkage.
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Which types of technologies has best helped scientists to study very high energy objects in outer space such as exploding supernova black holes and pulsars?
X-ray telescopes
Will the core of a high mass star turn into a nutron star?
It depends on the density. Low density = dwarf Medium density = neutron star High density = black hole
What are remnants of high mass star?
Neutron stars and black holes.
What kind of stars become black holes low mass or medium mass or high mass?
High-mass stars might become black holes, if the remaining matter (after the supernova explosion) is sufficiently large.
Does mercury have any density?
Very high density
Why are black holes the death of a large star?
When a star is at his end of his life, it expands. It will gradually expand till its own weight is to big to carry and the star implodes. A black hole isn't a hole, as many people think, but a object with an extremely high density, with such a high gravitational force that not even light itself can escape from it. The imploded star is such an object; it is a object with an extremely high density and therefore a large gravitational force. Only big stars can form black holes, cause they only have a large enough mass to form such a high density.
What types of technologies has best helped scientists to study very high-energy objects in outer space such as exploding supernovae black holes and pulsars?
radio telescopes
What cause thing to suck in a black hole?
The best answer to your question is that black holes are super massive. Massive objects have high gravitational pull which means that they will pull objects, including sunlight, into the black hole if something enters the black hole's event horizon.As opposed to common lore, black holes are not giant "vacuum cleaners" which roams around the universe destroying everything it comes near. Most galaxies are believed to harbor massive black holes and the stars in the galaxy are typically orbiting the the black holes instead of falling into them. In some cases, galaxies are disturbed(for example if two galaxies collide), and some solar systems may be pushed into the path of the black holes which will then "suck them in".
Which types of technologies has best helped scientists to study very high energy objects in outer space such as exploding supernova black holes and pulsars?
X-ray telescopes
Would a high-density polyethylene container be airtight and waterproof?
Yes, provided there were no holes in it.
Will the core of a high mass star turn into a nutron star?
It depends on the density. Low density = dwarf Medium density = neutron star High density = black hole
Why only very massive stars can come from black holes?
The question really should be "why do black holes only come from very massive stars". A black hole is formed when a super massive star explodes as a supernova. The remains at the core would collapse and become a very high density body, so dense that light will not escape the surface.
Why do you need to know the density of things?
To have knowledge about their property in the real physical world. You can also calculate how much mass an object has if you know how big it is. For example: * Low density objects floats on water. * High density objects sink in water.
What is the rotation speed of black holes?
as high as 98.7% of the speed of light
What are remnants of high mass star?
Neutron stars and black holes.
Are there really black holes in space?
Since black holes do not put out any light, we cannot see them. However, we can see the effect that they have on the area of space around them. Since black holes have extremely high gravity, they pull in surrounding material at very high speeds, causing this material to become very hot and emit X-rays. By finding this very hot material which is spiraling into black holes, astronomers can locate where some of them are. Also, astronomers study the motions of objects in space to see where there is material that might be moving as if a black hole were affecting it. So far, evidence had been found for the existence of black holes in the centers of several large galaxies, and in binary star systems (where two stars orbit each other).
What kind of stars become black holes low mass or medium mass or high mass?
High-mass stars might become black holes, if the remaining matter (after the supernova explosion) is sufficiently large.
