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About 100 tons of meteoric material fall on the Earth each year.

So the question really is how often will a 'significant' one arrive.

They appear to have been much less common in recent times compared to the 'Late Heavy Bombardment' about 3.8 to 4.1 Gya. (Giga years ago). Check for that under meteors or the GHB in say wikipedia. Or have a look at 'list of impact craters on Earth' in wikipedia. You could usefully plot the size and age of these events.

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11y ago

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