In addition, if two black holes attract each other and become one dense mass, how does that happen and why is it called suction? If two black holes can merge, do you get one big black hole and where does the suction come from?
Does that also have anything to do with gravity, so if a star gets smaller and smaller and eventually becomes a small black dense mass, how come we talk about a hole and if it sucks everything in where does it go?
In an earlier question I read that it becomes a mass and therefore not a hole, hence the question how it is possible that everything that comes close to that hole is sucked in?
Answer
In many places it is explained what a black hole is.
So there is indeed mass (usually very much) in a black hole. A black hole does not become mass, it is mass, and has all the properties of it. However, that does not mean that there is no more room. There is always room enough because the hole gets bigger and bigger as more mass is added.
The gravitational force of the mass in the black hole continues to attract and that is the ‘suction force’.
The name ‘black hole’ is a description, not to be interpreted as a hole in a wall or anything like that. It comes from the fact that the mass contained in it attracts so strongly that not even light (with a speed of 300000km/s) can escape from it. If we could look in the direction of such a ‘thing’, you couldn’t see anything at all. It looks like a ‘black hole’ between the stars and the rest of the universe in the sky background. Hence the name.
Answered by
dr. John Cuypers
Astronomy – Astrophysics – Variable Stars Calendars
Avenue Boechout 10 1020 Brussels
http://www.astro.oma.be/
.