Astro Bob: 50-foot space rock hits Earth every 50-60 years
Published 02/16/2013, Duluth News Tribune
Cosmic debris rains down through the atmosphere nearly every day, accumulating at a rate of 37,000 to 78,000 tons per year. While that may sound like a lot, much of it is dust or passes unseen over the oceans.Word count: 367
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