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Solar system's edge surprises astronomers

New observations reveal a dense ribbon structure that current models don’t explain

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3:16pm, October 15, 2009

The edge of the solar system is tied up with a ribbon, astronomers have discovered. The first global map of the solar system reveals that its edge is nothing like what had been predicted. Neutral atoms, which are the only way to image the fringes of the solar system, are densely packed into a narrow ribbon rather than evenly distributed.

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