English theoretical physicist, cosmologist, and author who was director of research at the Centre for Theoretical Cosmology at the University of Cambridge
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.
I think the human race doesn't have a future if it doesn't go into space.
A zero-gravity flight is a first step toward space travel.
Before 1915, space and time were thought of as a fixed arena in which events took place, but which was not affected by what happened in it. Space and time are now dynamic quantities... space and time not only affect but are also affected by everything that happens in the universe.
I have wanted to fly into space for many years, but never imagined it would really be feasible.
God is the name people give to the reason we are here. But I think that reason is the laws of physics rather than someone with whom one can have a personal relationship. An impersonal God.
I don't have much positive to say about motor neurone disease. But it taught me not to pity myself because others were worse off, and to get on with what I could still do.
I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first.
I grew up thinking that a research scientist was a natural thing to be.
Science is increasingly answering questions that used to be the province of religion.