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Aether (or ether) relates to the material which supposedly fills the entire universe. It is a concept used to understand action at a distance. Aether was described by Huygens as an "omnipresent, perfectly elastic medium having zero density", to support his wave theory of light.

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How do electromagnetic waves travel in a vacuum?

This is perhaps a total newbie question, and I will try to formulate it the best I can, so here it goes. How does an electromagnetic wave travel through for example, the vacuum of space? I usually s …
jotadepicas's user avatar