Two million years ago, something not quite human looked up at the sky and saw a glowing light, about the size of the moon, that hadn't been there before. That light was a huge eruption at the black hole at the centre of our galaxy, according to new research by astronomers. We can only make educated guesses at what our predecessors would have made of this strange sight, which took place long before recorded history. We're not even sure which species of hominin might have been looking. But what should we Homo sapiens make of it?
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