November 15, 2012

Did a Lost Star Tweak Earth's Orbit?

Ken Croswell, Science Now


AP Photo

One young star may yank another's developing solar system, a new theory suggests, accounting for planets that circle their stars on tilted paths. This idea may also explain a long-standing puzzle close to home: why Earth's orbit is tipped 7° relative to the sun's equator.

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TAGGED: Earth's Orbit, Planets, Stars

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