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.
God may exist, but science can explain the universe without the need for a creator.
No one can resist the idea of a crippled genius.
Life on Earth is at the ever-increasing risk of being wiped out by a disaster, such as sudden global nuclear war, a genetically engineered virus or other dangers we have not yet thought of.
Observations indicate that the universe is expanding at an ever increasing rate. It will expand forever, getting emptier and darker.
I first had the idea of writing a popular book about the universe in 1982. My intention was partly to earn money to pay my daughter's school fees.
Most people don't have time to master the very mathematical details of theoretical physics.
The Planck satellite may detect the imprint of the gravitational waves predicted by inflation. This would be quantum gravity written across the sky.
I don't have much positive to say about motor neuron disease, but it taught me not to pity myself because others were worse off, and to get on with what I still could do. I'm happier now than before I developed the condition.
Philosophers have not kept up with modern developments in science. Particularly physics.
We think that life develops spontaneously on Earth, so it must be possible for life to develop on suitable planets elsewhere in the universe. But we don't know the probability that a planet develops life.
The doctor who diagnosed me with ALS, or motor neuron disease, told me that it would kill me in two or three years.
Not only does God play dice, but... he sometimes throws them where they cannot be seen.
God not only plays dice, He also sometimes throws the dice where they cannot be seen.
God not only plays dice, but also sometimes throws them where they cannot be seen.
Science predicts that many different kinds of universe will be spontaneously created out of nothing. It is a matter of chance which we are in.
Sometimes I wonder if I'm as famous for my wheelchair and disabilities as I am for my discoveries.
Theoretical physics is one of the few fields in which being disabled is no handicap - it is all in the mind.
Science is not only a disciple of reason but, also, one of romance and passion.
No one undertakes research in physics with the intention of winning a prize. It is the joy of discovering something no one knew before.