How do stars go rogue?

Rogue stars are moving so quickly they're leaving the Milky Way, and never coming back. How in the universe could this happen?

Can super-fast stars unveil dark matter's secrets?

Zoom! A star was recently spotted speeding at 1.4 million miles an hour (2.2 million km/hr), which happened to be the closest and second-brightest of the so-called "hypervelocity" stars found so far.

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