How do astrnomers know that black hole exists?any observations being made?

Answer 1

Black holes can't be observed directly, because they emit no light. The Hawking radiation is inversely proportional to size, and only very small black holes would emit enough to be detectable. In some cases, the x-rays emitted by the disk of matter orbiting a black hole can be detected, though. The existence of a black hole is inferred in these cases when the orbital energy indicates a central mass too compact to be anything else.

So what astronomers can see is the gravitational effects of a black hole on its surroundings. You can calculate the mass of an object by the speed and radius of objects orbiting it. Astronomers have found a number of instances where the central object is so massive and so compact that it must be a black hole. These objects include both super-massive black holes in the cores of galaxies, and binaries in which a star is seen in orbit with an invisible companion - a stellar-mass black hole.

Astronomers have also observed gamma-ray bursts (GRBs) that match the behavior predicted for the collapse of a large star into a black hole.

Answer 2

A black hollow is the place the middle of a star has imploded, leaving no longer something yet organic gravity. The gravity is commonplace on a factor referred to as the singularity. that's in specific situations as small or smaller than the nucleus of an atom. the exterior is termed the form horizon, and gravity is so stable here that no longer even gentle can get away it. As regardless of count is sucked in plunges inward on the fee of sunshine, that's ripped aside, all the way down to the constituent aspects. no person knows for specific the place a black hollow leads, some say to a parallel universe, others to easily yet another component to our very own. no longer all black holes are undesirable. there is powerful evidence that a large-huge black hollow lies on the middle of our very own galaxy and extremely almost all others.

Answer 3

there are actually many ways :-
1. normally few stars revolve around a black hole and as we know any object in space revolves only around a more massive object. so scientists determine that there must be a black hole which is making it revolve around itself
2.gravitational magnification also helps. according to einstien's space time graph any light ray when passes near a massive body a star or a black hole it is magnified . there is a fixed limit magnification above which is too high for any normal spacious object . so it is inferred that a black hole must be there

Answer 4

Black holes are still theoritical. They are needed to explain the 90% mass missing in the universe. The reason they have come into existence is a mistake made by Einstein. When he looked at a moving mass, his assumption was that the moving mass had additional mass added to it by means of energy. His concept worked for finding E=mc2, but was still wrong.

What happens within a moving mass, is that the overall frequency of the moving mass increases in direction of movement and has a proportional decrease of frequency at right angles to it. It is for this reason that mass moves at all.

There is a frequency trilogy that explains this condition, it is:

hf = E, shows that energy in this form increases with the increase of wave frequency in a particular distance. Radio waves have very long peaks between waves, while cosmic radiation has trillions of peaks in the same distance.

hf = mk, kinetic energy within a mass, because it is formed of electromagnetic energy, is subject to the same laws as the above. As a mass moves, in the direction of movement there is an increase of frequency. A mass at rest has the capaciity of energy moving in any direction the value of "c". At the speed of light minus 2 ft. per second, energy could move at right angles to direction of travel only 2 ft. per second. At the speed of light there would be zero potential of energy movement at right angles to direction of travel.

hf = c, is the basis of all mass energy structures, and appears to be the basis of electromagnetic energy.

Answer 5

They can be seen via the radiation they give off. When molecules come towards the event horizon (the edge) half gets pulled in which causes a reaction thus realsing the other half with energy in the oppisite direction. These molecules with stange radiation signatures can be seen with speacialised telescopes.

Answer 6

Ofcourse there are observations made.

There are methods like X-ray detection methods in space vehicles which detect X-rays emerging from the black holes.


>>(also the black holes release other electromagnetic rays)

Answer 7

the extreme gravity of a black hole can bend light and this disturbance can be detected by radio telescope on earth.

Answer 8

hubbles telescope must have observed some stars disappearing suddenly and without any clue
its job is to keep a watch on stars , meteroids,etc

Answer 9

lightbends around certain stars or regions of the Universe.

Answer 10

blackholes also emit a specific type of radiation called hawking radiation.