“Time travel used to be thought of as just science fiction, but Einstein's general theory of relativity allows for the possibility that we could warp space-time so much that you could go off in a rocket and return before you set out.”

Theoretical physicist and cosmologist from the UK, active in the 20th and 21st centuries. His work revolutionized the understanding of black holes, singularities, and the origins of the universe. Known for bridging complex physics with accessible public engagement, he also explored the intersection of science and philosophy.