Inspired by Roger Penrose 's theorem of a spacetime singularity in the centre of black holes , Hawking applied the same thinking to the entire universe , and during 1965 wrote his thesis on this topic .
[ 147 ] Inspired by Roger Penrose 's theorem of a spacetime singularity in the centre of black holes , Hawking applied the same thinking to the entire universe , and during 1965 wrote his thesis on this topic .