Physicist: Nope.
A blackhole is already the result of over filling. A blackhole is to mass as the rage virus is to people; throwing more at it just makes it more dangerous. However, unlike zombies, blackholes do eat each other.
The more matter that falls into a blackhole, the bigger the blackhole becomes. For example; the blackhole at the center of our galaxy (Sagittarius A*) has a mass of about 4 million suns, which is already the size of some small galaxies. Small globular clusters anyway.
If all the matter in the universe were chucked into the same giant blackhole you’d have: a really giant blackhole.
Is it known if Sagittarius A (or any other black hole) is already big enough to one day stop the expansion of the universe?
Or is the expansion fast enough to keep escaping the black holes?
The total gravitational attraction of a bunch of mass is a function only of the amount of mass. So whether the mass takes the form of a solar system, or a black hole, or a diffuse gas cloud makes no difference.
Black holes are only impressive if you’re fairy close to them. For example: if the sun were to suddenly collapse into a black hole, the Earth would continue to stay in exactly the same orbit.
Prior the big bang wasn’t all of the matter in the universe in a single point? Wouldn’t this be a black hole then?
A couple of questions, all on the theoretical side (mostly because I doubt we’ve been in existence long enough to observe such things) about black holes:
i) in recent theory, it’s thought that most galaxies start off small and ‘eat’ other galaxies to get bigger. What happens to the black hole in the center of the smaller galaxy? Does it get absorbed into the center of the devouring galaxy, or is it more likely to be a wandering body within the larger galaxy?
ii) The most recently known ‘snack’ galaxy is the aquarius stream, about 70 million years ago (roughly when the earth formed), are there any guesses what happened to its central black hole?
iii) Do all galaxies have a black hole in the center? Is there a theoretical estimate to the minimum galaxy size possible?
i) I’ve heard that the simulations tend to show the black holes finding each other in fairly short order. But, for a while after merging you can have “double yolk” galaxies.
ii) Globular clusters and dwarf galaxies don’t tend to have their own super-massive central black holes. Generally, only large galaxies have central black holes, and when large galaxies merge, they don’t cleanly merge and leave streams, they mix chaotically. So, if there’s a stream of stars in your galaxy that used to be a tiny cluster that was absorbed, it probably didn’t have a central black hole, or at least not much of one.
iii) Groups of stars come in such an amazing range of sizes and shapes that it’s tricky to just say galaxy. So, astronomers sometimes use the presence of a central super-massive black hole to define whether or not something is a galaxy. They also often use the presence of dark matter to define if something is or isn’t a galaxy.
i) On that scale (time needed for the fusion), looks like life on habitable planets would only be affected if the churning results in unwelcome visitors (i.e. another star, planetoid with enough mass to disrupt orbits, or a black hole). With a civilization of our technology level, how much would be observed (or even noticed at all?)? This is all hypothetical pondering, mind, I’m aware there’s no hard data readily available.
ii) Well, that explains whether our Galaxy get to keep its arms when it gets absorbed into Andromeda! Do dwarf galaxy not count as ‘real’ galaxies in terms of supermassive black hole + dark matter content, then?
iii) Let me rephrase the question, then XD What’s the minimum mass for a black hole to be declared ‘supermassive’? Or better, what’s the SMALLEST supermassive black hole observed? Is there a rough estimate for the dividing line of ‘inferred’ dark matter mass for a collection of star systems to be declared a galaxy?
i) The big thing that living things would have to worry about is a sudden increase of star formations, which means a sudden increase in super novas, which sterilize big chunks of the galaxy around them. Even during a merging stars are very far apart.
ii) Not sure about the general definitions. Galaxies can vary so widely that defining one type vs. another is about as ad hoc as defining “blueness”.
iii) Same issue. But generally they have the mass of thousands of stars, instead of the mass of just one or two.