![]() There was no proof it existed, other than that the scientific establishment had accepted the concept. It might be considered the first “dark matter,” an undetectable something theory said should be out there, the explanation for a number of problems having to do with electricity, the movement of light, even the whole concept of “nothing.” It was, according to one early-20th-century physicist, “accepted as a necessity by all modern physicists.” But as Einstein’s theory noted, there was no experimental confirmation for the substance. ![]() In the 19th century, ether (not to be confused with the once-popular anesthetic diethyl ether) was the medium that scientists believed filled space. In the U.S., a few understood it, but, in general, relativity was ridiculed as “totally impractical and absurd.” ![]()
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