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If we assume we've arrived: we stop searching, we stop developing.
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When I became a professor of physics circa 1991, I doubled the number of female professors of physics in the U.K.
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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.
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Some of the hydrogen in your body comes from the Big Bang, and when you see a kid walking down the street with a helium balloon, you can say, 'There goes some of the primordial universe.'
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Radio astronomers are aware in the back of their minds that if there are other civilizations out there in space, it might be the radio astronomers who first pick up the signal.
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I positively encourage time abroad to anybody. It's worth taking the time to suss out which countries in the world are well funded for your subject and look for opportunities there.
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Looking at the universe as a whole; cosmology, the birth, life and death of the whole universe, we used to have a nice simple model. Then we had to add things like dark energy, and our nice simple picture is getting messier and messier and messier.
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Scientists should never claim that something is absolutely true. You should never claim perfect, or total, or 100% because you never ever get there.
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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.
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By the end of my PhD I could swing a sledgehammer.
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I became conscious in later life that I had been given an education that enabled me to do all kinds of jobs, but often, jobs weren't open to me.
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I didn't always have research jobs.