How many space rocks hit the moon every year?

When NASA sent humans to the moon in 1969, one of the many hazards the agency had to anticipate was space rocks penetrating astronauts’ spacesuits or equipment. Unlike Earthwhich has a protective atmosphere in which meteoroids usually disintegrate, the moon is vulnerable to whatever rocks, or even specks, are whizzing around in space.

Thankfully, the astronauts weren’t in too much danger, according to Bill Cooke, head of NASA’s Meteoroid Environment Office at NASA’s Marshall Space Flight Center in Alabama. “The odds of an astronaut being hit by a millimeter-sized object is like 1 in 1 million per hour per person,” Cooke told Live Science. (A millimeter is the largest a meteoroid has to be to penetrate an astronaut’s spacesuit.)

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