Encounters with Jupiter send asteroid on a bizarre backward spin

Enlarge (credit: NASA)

Jupiter is widely credited with providing Earth with a bit of protection. The immense gravity of the gas giant typically either sucks in asteroids and comets or flings them out into orbits where they pose our planet little danger. But astronomers have now identified an asteroid that's in a stable orbital interaction with Jupiter. That interaction sends the asteroid around our Solar System backward and causes it to shift between two radically different orbits without...

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