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¿Question #220234?
pricero1: Why doesn't Mercury have any atmosphere?

TomTi89: Basically what Michael said. Or we can just say a wizard did it.
Fribian: That's a heavy question that rolls around in my brain too much.
mattomaw: What do expect with a 500 hour long working day?
mr3d: to easily fit in thermometers
PolarDad: Being blasted by solar wind from the sun and having little to no defense (little gravity due to small size and weak magnetic field)