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Although we don't know what is outside our universe, astronomers still wonder. Several pictures of what there might be have been dreamed up. An interesting one, called multiverse, has lots of universes. Picture it as a foam of bubbles. Our universe would be one bubble, and we'd be surrounded by lots of other bubbles.
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.
In the field of astronomy in the mid-'60s, quasars were very sexy objects - gigantic, star-like masses about which little was known. I was a graduate research student at Cambridge working towards my Ph.D. and chose quasars as the subject for my thesis. Part of my project involved surveying the sky for them using a radio telescope.
There's some evidence that if you're recruiting, you tend to recruit a mini-me. Then you have a very comfortable group round a table. You all think alike. You agree. People are arguing that the banking crisis was because too many of the relevant bodies were thinkalikes, and that if they'd had more diversity, maybe it wouldn't have happened.
We live inside our universe and cannot get a bird's-eye view of it from outside. And we cannot even see all of our universe. Distant parts of it are expanding away from us so fast that they are invisible; they go faster than the speed of light. Having bigger telescopes to see fainter stars will not help us here: invisible is truly invisible.