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Bob Mizon’s day jobs include taking his travelling planetarium across the UK to show schools and communities what they can no longer see with the naked eye. His book Light Pollution (Springer, £22) explains what went wrong with the sky and campaigns for a return to the dark nights of his youth. He concludes: the light from distant galaxies has taken millions of years to reach us – what a tragedy to lose it in the last millisecond of its journey.