Space Dust
The Earth gains quite a bit of weight each year as dust from comets and asteroids rains down on the planet.
Writing in the journal Earth & Planetary Science Letters, researchers say their 20-year study collected samples of the space debris, ranging from 30 to 200 micrometers in size, near the Franco-Italian Concordia research station in Antarctica. The scientists from France’s National Center for Scientific Research then calculated that Earth receives about 14 tons of the micrometeorites each day. They believe 80% comes from comets and the remainder from asteroids.
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