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EVERY so often, our planet’s path around the sun takes us through part of the solar system littered with the debris of a long-departed comet or asteroid. Dust and rocks come hurtling towards Earth. They hit our atmosphere, where they suddenly slow down and burn up, producing a beautiful display in our skies. Some of these meteor showers produce more dazzling displays than others, and the Perseids meteor shower, which peaks on 12 August this year, is one of the best.
It is caused by a cloud of debris left in the wake of Comet Swift-Tuttle, which takes 133 years…
