5,200 tons of space dust falls on Earth each year, study finds

Every year 5,200 tons (4,700 metric tons) of interplanetary dust particles reach the Earth’s surface, a new study reports.

These novel findings suggest that cosmic dust is the main source of extraterrestrial material on Earth, far exceeding the input from larger, more visible meteorites, which are considered to bring less than 10 tons (nine metric tons) of material to Earth every year. 

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