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Mercury is a small planet and therefore has trouble holding on to an atmosphere. scientist account for the extremely thin atmosphere that was found around the planet in 1985. This atmosphere found on mercury because the Sun's "wind" of particles is chipping atoms off the surface of Mercury.
The location of Mercury is not perfect for an atmosphere. The rocky planet, which orbits the sun barely a few million miles away, is continuously pummelling by solar weather. Mercury is always under attack from the star's swift winds, which hurl charged particles towards the planet's surface.
Material from the surface of the earth is propelled into the air by both the particles themselves and the heat they generate. The lightest atoms are impacted by gravity and solar photon pressure, while the heaviest atoms drift back to the surface. As a result, the exosphere, a fragile atmosphere, is created.
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