The Physics of the Universe - Difficult Topics Made Understandable
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Each cubic meter of air on Earth contains about 10 trillion trillion molecules. This falls to around 4 trillion trillion at the top of Mount Everest. A hundred kilometers up, sometimes considered to be the border of space, there are around a million trillion molecules per cubic meter. At the International Space Station, roughly 350 kilometers away, there are only around 10 trillion.

100,000 kilometers from the Earth (over a third of the way to the Moon, where there is absolutely no influence from the Earth’s atmosphere), there are around seven million particles per cubic meter. At the edge of the Solar System, the density is down to about a thousand atoms per cubic meter. In intergalactic space, there are only about ten atoms per cubic meter of space.

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