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The refractive index of air at standard temperature and pressure is 1.00029. Outer space is much more rarefied and so the index is closer to 1 but it is still denser than a total vacuum and so the index is greater than 1. This means that electromagnetic waves with smaller frequencies will travel slower. Thus, blue light will travel slower than red.

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7y ago
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7y ago

All electromagnetic waves travel at the same speed through a vacuum - the so-called "speed of light", which is exactly 299,792,458 meters per second, by definition.

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Q: Which type of electromagnetic wave if any travels through space at the slowest speed?
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