The Physics of the Universe - Difficult Topics Made Understandable
Random Facts:


Each cubic metre 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 kilometres up, sometimes considered to be the border of space, there are around a million trillion molecules per cubic metre. At the International Space Station, roughly 350 kilometres away, there are only around 10 trillion.

100,000 kilometres 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 metre. At the edge of the Solar System, the density is down to about a thousand atoms per cubic metre. In intergalactic space, there are only about ten atoms per cubic metre of space.

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