THE MYS­TERY

Cosmos - - Dark Matter -

New­ton’s law tells us that grav­ity de­creases in pro­por­tion to the dis­tance squared, so stars on the outer reaches of the galaxy ( B) should ro­tate more slowly than stars closer to the cen­tre ( A). In fact, beyond a cer­tain dis­tance from the galaxy’s cen­tre, star speeds stay mys­te­ri­ously con­stant.

Dis­tance from ga­lac­tic cen­tre

Dis­tance from ga­lac­tic cen­tre

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