What is the morphology of a black hole?

1 — “Can a black hole overeat?”
I guess when scientist actually reach one they can probe it and find out.

2 — “How big is your average black hole?”
They don’t know that? Again, when they actually reach one I guess they can measure it.

3 — “What happens when a black hole evaporates?”
If they did, compared with what they are said to be able to do, that would be a good thing. However, if the theory holds true about black holes, how could they? They just keep sucking things in.

4 — “Would an ordinary black hole attract antimatter?”
Who knows? Find some antimatter and then the scientist can fire some at it and see if it attracts like a magnet or bounces off like a ping pong ball against a brick wall.

5 — “Could you kill an ordinary black hole by feeding it antimatter?”
That would depend on how #4 turned out.

@Hypocrisy_Central Questions 1 through 5 already have answers that get to the heart of the above speculation. And as to black holes evaporation, yes they do. There is a link in the question details leading to an explanation of the physics behind the phenomenon. It only happens when they become isolated from matter to pull in, or when they are very small to begin with. If you find astrophysics as fascinating as I do, go check some of the more studied answers the above questions got, and the links to external resources on them.

In addition to what has already been said:

1 — “Can a black hole overeat?”
No, as far as I know.
2 — “How big is your average black hole?”
Stellar black holes are far more frequent than supermassive black holes. Tiny primordial black holes might the most common ones, if they do in fact exists.
3 — “What happens when a black hole evaporates?”
Quantum tunnel effects might make the black hole disappear completely but we are talking octillions of years or more for that to happen
4 — “Would an ordinary black hole attract antimatter?”
Not sure.
5 — “Could you kill an ordinary black hole by feeding it antimatter?”
Not sure.

My understanding is that black holes are perfectly spherical, however the matter surrounding them is disk shaped. “A supermassive black hole (SMBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses. Most—and possibly all—galaxies are inferred to contain a supermassive black hole at their centers” <http://en.wikipedia.org/wiki/Supermassive_black_hole>. I believe a black hole is just inside its event horizon. Theoretically, a singularity exists at its center and, therefore, its distance would be the radius of the event horizon.

1—Black holes can overeat. The excess is jetted as streams of energy, light-years wide, radiating from its poles.
2—Since we cannot count the number of galaxies (presumed to contain SMBHs), and the existence of black holes not at the center of galaxies are difficult to identify, an average size is unknown.
3—Guessing, the singularity vanishes along with any gravitational attraction.
4—I would think that any anti-matter drawn toward a black hole would be annihilated by matter closest to the event horizon.
5—See 4.

@mattbrowne & @Bill1939 Thanks. I appreciate the informed perspective you guys bring. @Bill1939 Have we fully resolved whether antimatter is attracted to or repelled by the mass attraction of ordinary matter?

@ETpro, since antimatter atoms have positrons in orbit, I would imagine that their charge would draw them to ‘normal’ atoms. However, if antimatter has anti-higgs bosons (antimatter’s spin being opposite to ‘normal’ matter) it might have antigravity. If so, this force would inhibit attraction. However, since the force of charge is greater than the force of gravity I guess it would be unlikely antigravity would prevent contact. Such armchair conjecturing is fun.

@Bill1939 Thanks. Fun for me too.