The moon has virtually no atmosphere. The atmosphere it does have is tiny and this is apparent in the number of asteroids and meteors that make craters in its surface. This is also the reason astronauts need spacesuits to survive there. Radioactive decay and impacts on the moon contribute to the weak atmosphere that exists.
Fun fact to put its size into perspective:
If you captured the entire atmosphere of the moon it would weigh in at about 10000 kg, or about the same weight as a large truck.
“If the earth’s atmosphere were compressed to the density of steel, it would form an armor plating 49 in. thick, but the moon’s meager atmosphere, compressed in the same way, would be only one-millionth as thick as the thinnest soap-bubble film.”
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