Science: Vera Rubin studied galaxy rotation in the 1960s-70s and…

Question

Did you know? Vera Rubin studied galaxy rotation in the 1960s-70s and noticed something strange: the outermost stars were moving as fast as the innermost ones. By gravity that should be impossible — unless there was an invisible mass. This was the first convincing evidence for "dark matter".

Accepted Answer

Vera Rubin studied galaxy rotation in the 1960s-70s and noticed something strange: the outermost stars were moving as fast as the innermost ones. By gravity that should be impossible — unless there was an invisible mass. This was the first convincing evidence for "dark matter".

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