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By measuring it's gravity. The faster things are orbiting the black hole, the more gravity and the more mass it has.

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Q: How can scientists determine the mass of a black hole?
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Is an Intermediate-mass black hole a type of black hole?

Yes. Intermediate-mass blackhole is a medium size black hole. Scientists have found stellar black holes and supermassive black holes but there is no prove that Intermediate-mass black type of black holes exist. My opinion is that they do exist because when a black hole is becoming a black hole supermassiveblack hole it will need to go though this stage of intermediate-mass black hole.


What happens to a mass when it is swallowed by a black hole?

The object swallowed by the black hole is destroyed; its mass is added to the mass of the black hole.


How do scientists calculate the mass of a black hole?

Scientists calculated indirectly the mass of a black hole by the behavior of matter around it, from which its gravitational pull can be determined, and with an accurate measure of its distance, its mass can then be inferred. In some cases an upper limit can be calculated by the closest approach of a visible object observed near it; in this case, its size is a result of a direct relation to its mass since the radius of the event horizon is directly proportional to the black hole's mass.


How can the mass of a black hole can be measured?

The mass of a black hole can be measure by the effects of its gravity on surrounding objects.


Is there a black hole in the milky way?

Scientists are now largely convinced that there is indeed one at the centre of the galaxy... the evidence indicates a compact high-mass object there; if it's not a black hole, we don't know what else it could be.


Do Black holes suck in all Matter?

No; I am not in a black hole yet.A black hole, like any other object with mass, will attract objects that are near by.No; I am not in a black hole yet.A black hole, like any other object with mass, will attract objects that are near by.No; I am not in a black hole yet.A black hole, like any other object with mass, will attract objects that are near by.No; I am not in a black hole yet.A black hole, like any other object with mass, will attract objects that are near by.


How big do event horizons get?

Assuming you mean the event horizon of a black hole (there are other types as well), the diameter of a black hole as measured by its event horizon is directly proportional to its mass. The larger the mass, the larger the diameter. Thus, as a black hole's mass increases, it will get bigger. The only limitation is how much mass a black hole is able to incorporate from its surroundings.


What do scientists think is in center of the Milky Way?

The very center is believed to contain a very powerful black hole.


What becomes of energy when it is sucked up into a black hole?

Such energy has a mass equivalent (m = e/c2). Any such mass falling into the balck hole will increase the mass of the black hole.


What has mass but no volume?

a black hole


Does the hole in a black hole expand the older the black hole gets?

No. If no matter enters a black hole it will actually slowly lose mass and shrink via Hawking radiation. A black hole will gain mass if matter fals into, which will cause the event horizon to grow.


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.