Professor Xavier Calmet of the University of Sussex told Newsweek the findings ould mean black holes are "much more complicated and interesting than naively imagined."
The theory of general relativity, which describes the nature of gravity, revolutionized science after its publication in 1915.
The great German physicist published his groundbreaking theory in 1915.
The study has proved the theory holds beyond the Milky Way.
The theory breaks with the popular idea that expansion is caused by dark energy and suggests energy for expansion would never run out.