Professor Stephen Hawking made immense contributions to the world of science.
But he also had some great things to say about life, family and disability.
Here are a collection of his best and most inspiring quotes that will live with us long after his death.
1. On human contact with aliens.
On the possibility of contact between humans and aliens: ‘I think it would be a disaster. The extraterrestrials would probably be far in advance of us. The history of advanced races meeting more primitive people on this planet is not very happy, and they were the same species. I think we should keep our heads low’.
-In Naked Science: Alien Contact, The National Geographic Channel, 2004.
If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans. We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet.