Space weathering is the type of weathering that occurs to any object exposed to the harsh environment of outer space. Bodies without atmospheres (including the Moon, Mercury, the asteroids, comets, and most of the moons of other planets) take on many weathering processes: collisions of galactic cosmic rays and solar cosmic rays, irradiation, implantation, and sputtering from solar wind particles, and bombardment by different sizes of meteorites and micrometeorites.
Space weathering is the type of weathering that occurs to any object exposed to the harsh environment of outer space. Bodies without atmospheres (including the Moon, Mercury, the asteroids, comets, and most of the moons of other planets) take on many weathering processes: collisions of galactic cosmic rays and solar cosmic rays, irradiation, implantation, and sputtering from solar wind particles, and bombardment by different sizes of meteorites and micrometeorites.
Source: Wikipedia "Space weathering" · CC BY-SA 4.0
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