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Robert Walker
The moon has a very thin atmosphere, made of some heavy gases. But it's roughly equivalent to the atmosphere at the levels of the ISS - probably too thin for even a very lightweight balloon to float

Is There an Atmosphere on the Moon?

See also

How far could balloons go, can they escape into outer space, what happens to them when they reach their topmost point, and what are the scientific reasons for such an inquiry?

About the Author

Robert Walker

Robert Walker

Writer of articles on Mars and Space issues - Software Developer of Tune Smithy, Bounce Metronome etc.
Studied at Wolfson College, Oxford
Lives in Isle of Mull
4.8m answer views110.4k this month
Top Writer2017, 2016, and 2015
Published WriterHuffPost, Slate, and 4 more