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How much beer will it take for sparkchaser to sing a Wham! song on karoke?
Asteroids with a 1 km (0.62 mi) diameter strike the Earth every 500,000 years on average. Large collisions – with 5 km (3 mi) objects – happen approximately once every ten million years. The last known impact of an object of 10 km (6 mi) or more in diameter was at the Cretaceous–Tertiary extinction event 65 million years ago.