Fifty years ago, Bernard Carr wrote in New Scientist about the mounting evidence for black holes. Now, evidence for these objects is incontrovertible, and Carr is back writing for us – this time about black holes older than the universe
ALMOST exactly 50 years ago, when I was a PhD student, I wrote an article in this magazine about the mounting evidence for black holes, regions of space in which gravity is so strong that light can never escape. Today, there is no longer any doubt about their existence. We know they form from collapsing stars and that supermassive ones sit at the centres of galaxies. We have even
. But in my article I also mentioned a more speculative possibility: that smaller black holes might have formed in the early universe, shortly after the big bang.
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