Micrometeoroids

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Space Debris is an umbrella term that refers to the countless number of small natural and man-made items that orbit Earth and represent a risk to spacecraft. The technical term is Micrometeoroids and Orbital Debris to capture both types of debris.
1) More than 5,00,000 pieces of debris or space junk are tracked as they orbit the earth.
2) The space debris all travel by speed up to 17,500 mph, which is fast enough for a relatively small piece of orbiting debris to damage a satellite or a space craft.

@wikipedia