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Dark Matter Mystery
While carefully measuring the speed of rotation of galaxies, astronomers
stumbled upon a profound cosmic mystery.
 They
could estimate what the rotation speed should be by calculating the mass of all
the visible stars and gas, thereby determining the gravity of the galaxy. Much to
their surprise, the measurements showed that most galaxies are rotating faster
than they should. Not a little faster. Much faster! More than twice as fast. This
meant that, according to Einstein's theory of gravity, these galaxies should be
flying apart. Yet clearly, they are not.
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