The universe is very big - there's about 100,000 million galaxies in the universe, so that means an awful lot of stars. And some of them, I'm pretty certain, will have planets where there was life, is life, or maybe will be life. I don't believe we're alone.

I think failing the qualifying or the 11-plus actually hurt me more than I realised. After I'd become a professor of physics at the Open University, I suddenly thought, 'This is a bit silly.' So I suddenly became much more open about it. But I think probably I was hurt by the failure and didn't want to talk about it.

I think failing the qualifying or the 11-plus actually hurt me more than I realised. After I'd become a professor of physics at the Open University, I suddenly thought, 'This is a bit silly.' So I suddenly became much more open about it. But I think probably I was hurt by the failure and didn't want to talk about it.

I may not have got the Nobel Prize, but I've won countless other awards, including 'Most Inspirational Living Woman Scientist.'