By combining space and time into a single manifold , physicists have significantly simplified a large number of physical theories , as well as described in a more uniform way the workings of the universe at both the supergalactic and subatomic levels .

By combining space and time into a single manifold , physicists have simplified a good deal of physical theory , as well as described in a more uniform way the workings of the universe at both levels : the supergalactic and subatomic .
