The ABC of Relativity, by Bertrand Russell, Part 2
Boring Books for Bedtime Readings to Help You Sleep
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The Distance Between Two Events Is Not a Physical Factor
If two bodies are moving relatively to each other, we can only speak of the distance between them at a given time. Different observers will judge differently as to what is the same time for an event in the train, and an event in Edinburgh. This makes the measurement of distances relative in just the same way as the measurement of times has been found to be relative. The distance in space between two events is therefore not in itself a physical fact.
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