Two quotes by Stephen Hawking.
The human race is just a chemical scum on a moderate-sized planet, orbiting around a very average star in the outer suburb of one among a hundred billion galaxies. We are so insignificant that I can’t believe the whole universe exists for our benefit. That would be like saying that you would disappear if I closed my eyes.”
Reality on the Rocks, TV series
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.”
Into the Universe with Stephen Hawking, TV series
John Oliver’s interview with Stephen Hawking:
Stephen Hawking: Artificial Intelligence Could be a ‘Real Danger’
Stephen Hawking in Favour of Assisted Suicide