tcd004 writes: An asteroid is caught in a synchronized orbit with the Earth, dancing back and forth relative to our planet as both circle the sun, a team of Canadian scientists has discovered. The object, which for now is dubbed 2010 TK7, is a "Trojan" asteroid, meaning that it is trapped in a delicate gravitational balance between a tug from the sun and an equal tug from the Earth. It's long been known that Jupiter, Neptune and Mars have Trojans orbiting alongside them, but this is the first time one has been found alongside our planet.
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