Einstein's general theory of relativity describes the stars distort spacetime fabric and it appears a black hole makes a hole in the spacetime fabric. It is evident that the size of a galaxy does not change due to gravity but in large scale the distance between two distant galaxies increases due to the metric expansion of space. Therefore, does a black hole cut the fabric of spacetime as it changes is position as the distance of galaxies increases? It is known, most of the galaxies contain million of stars, many black holes and specifically a supermassive black hole in its centre. Therefore, I was wondering about the consequence of the curvature of spacetime caused by an entire galaxy! Can you suggest?