Black holes one of the most amazing things in the universe.it is known that they swallow every substance that passes the event horizon, even light. This is one of the important reasons why they are black holes. So how do they not swallow the universe itself after a point by absorbing and swallowing the space into it even when swallowing the light?
Because black holes destroy the space-time geometry around them because of their dense mass, light cannot escape black holes in such a twisted space-time structure. When black hole swallows the big amount substance they get bigger but it is not something it did without a break. That is the idea of a black hole that constantly swallows and grows as it swallows and as a result of which it can swallow the universe is not true.
The universe is expanding constantly and rapidly. The pace of expansion is constantly increasing. For the black hole to swallow the universe, the universe must be caught in the event horizon. This is also impossible.
Until now, one of the biggest discovered black hole NGC1277. It swallows e nearly half sun mass matter in one day. 1 million years after the big bang, it was as big as 5000 suns. Now, it is as big as 70 billion suns. However, a very long time passed. The growth rate equals 1% every 1 million years. In other words, it took 70 million years to double its mass, and it was able to make up 14% of the total mass within the galaxy. Considering the growth rate and size of the universe, it is unlikely that a black hole will absorb the universe.
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