Do Black Holes get bigger when they suck in objects?
Yes, the mass of the black whole is equal to the mass of the star that collapsed to form it plus all of the matter that has fallen into it. That’s why you may hear them talking about “supermassive black holes”, those which have a mass of billions of times our sun’s mass. It is unknown exactly how a black hole’s volume increases as matter falls into it, but it’s generally thought that once the core collapses into a singularity, all matter that is subsequently added becomes part of that singularity (which has zero volume). However, the definition of a black hole can include everything within the Swarzchild radius, which is the same as the event horizon. As more matter falls in and the total gravity increases, the event horizon will grow, however the bulk of the matter goes straight to the singularity.
