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Ever wonder why some meteor showers are so unpredictable?

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SETI Institute researchers show that this is not due to the random pull of the planets, but rather the kick they receive from a moving Sun .

"Contrary to popular conception, everything in the solar system does not orbit the Sun ," said lead author Stuart Pilorz .

The Sun and planets all orbit their common center of mass, known to scientists as solar system barycenter.

The Sun 's place and velocity in its orbit around the barycenter when each meteoroid encounters it.

Meteoroids at different locations in the stream encounter the Sun at different times, so they get different kicks over time.

From the measured shower dispersions, the team calculated the ages of over 200 long-period comet meteoroid streams.

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