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There is a lot more that astronomers don't know about black holes than they do know about black holes. While the formation and evolution of black holes has been modeled after stellar formation and evolution, what has not been specifically proven is how black holes really formed. Some hypotheses speculate whether black hole formation preceded star formation; i.e. whether black holes are a remnants of the initial Big Bang creation event.
Also there is no real empirical evidence that black holes can grow or shrink. Rather what has been observed is that there are many black holes of varying sizes and behaviors. And from these collective observations scientists have conjectured upon the possible evolution of black holes based on the stellar model of evolution and the principles following the same pattern of gravitational accretion as normal matter.
Problem is that there is no real empirical evidence that matter exists beyond the event horizon of a black hole. Consequently, there are no measurements relevant to growth such as increased density relative to its static size or increased size relative to its static density. Rather mass is calculated based on the rotation speed of the black hole; i.e. faster rotation calculated to express a greater mass.
This also confuses the issue of whether the black hole's mass is due to immensely dense matter or immensely dense plasma energy. There is no way to peer beyond the Event Horizon of a black hole to gain any resolution of its really make up. Even internal temperature of a black hole is unknown.
Additonally, the latest consensus is that there is not a relevant relationship between the observable size of the accumulated bulge about the Black Hole and the size of the Black Hole itself.
What else can I help you with?
How can astronomers detect where black holes are if no form of radiation can ever get out of a black hole?
There are two ways of detecting black holes indirectly. First, it is possible to observe the effects of a black hole's gravity on nearby objects. Second, while no radiation can come from within a black hole's event horizon, mater that has not yet crossed can still be seen. If a large amount of matter is falling toward a black hole, then it can become superheated and emit intense x-rays.
What is beyond a black hole?
Science has yet to fully prove what lies beyond a black hole.
What will happen in TIME if you stay too long beside a black hole?
Scientists cannot be certain, as we have yet to experiment with a black hole, but they theorize that time would slow down relative to time far from the black hole.
What happens at a black hole?
When an object enters a black hole, it starts being stretched. As it moves closer and closer to the center of the black hole, the gravitational pull on the part of the object that is closer to the center becomes more powerful than the gravitation pull on the part of the object that is farther away from the center. The objects keeps on getting stretched until it reaches the center of the black hole. We don't yet know what happens at that point.
In which city was the famous black hole?
No one is 100 % sure that Black Holes really exist. Mathematics tell us that they should exist, but it has not been proved yet. Most physicists believe they do exist in our universe. We could have Black Holes that may be a billion times larger than our Sun.
How is the formation of a normal black hole different from the formation of a supper-massive black hole?
It is not yet known for sure how a supermassive black hole acquires the enormous mass it has. It is possible that it starts as a normal black hole, and then gets more mass. It is also possible that from the start, a much larger amount of mass than in a normal black hole collapses.
Does M65 galaxy have a black hole?
Yes, the M65 galaxy is thought to have a supermassive black hole at its center, like many other large galaxies. This black hole likely plays a crucial role in shaping the galaxy's properties and evolution.
Do astronomers know what a black hole really is or is it mostly assumptions?
Astronomers know what a black hole "is", for the very simple reason that such is a matter of definition. One could argue, however, that the certainty of their existence does not imply a perfect understanding of their characteristics. Some information about black holes remains unknown; for example, the nature of the matter in the singularily it not yet adequately described by current physical theory. But much of the theory and in particular the mathematical derivations describing them (e.g., solutions to Einstein's field equations contained in general relativity) have withstood decades of scrutiny. The difficulty exists in that fundamental tenets of science itself are based on observation, and due to a black hole's nature - not permitting light itself to escape - it is not possible to directly observe them; however, indirect observational evidence of their existence is overwhelming - from gravitational lensing to properties of their accretion disks to the behavior (motion, orbits, acceleration) of nearby celestial objects. For example, a recent study of the motion of stars at the core of our Milky Way indicate a mass present, millions of times the mass of the Sun yet concentrated into a small area, circumscribed by orbits of nearby stars approaching it so closely yet not colliding with it, that a compelling interpretation remains with no room for anything else except the presence of a black hole.
Is a black hole truly a vacuum, or does it contain matter and energy that we have yet to fully understand?
A black hole is not a true vacuum, as it contains matter and energy that we do not fully understand.
How was the massive black hole made in the center of the Milky Way Galaxy?
That is not yet known for sure. Most large galaxies have a supermassive black hole in their center. It is known how a massive star can convert to a black hole, but it is not currently known how such a black hole would acquire such a huge mass since its creation.
How can astronomers tell whether a black hole exists in the center of a galaxy?
Astronomers can detect a black hole's presence in the center of a galaxy by observing stars and gas orbiting around an invisible central point, showing the influence of a massive object. They can also study the emission of radiation and energy coming from the region, along with detecting gravitational waves produced by the black hole's activity.
What is M in MBH?
Perhaps this stands for Micro Black Hole, a theoretical concept yet to be proved.
