Photo: Voyager Probes Send Surprises From Solar System's Edge

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NASA's Voyager 1 spacecraft is sending back signals from the heliosphere, the outer layer of our solar system. Beyond the heliosphere lies interstellar space. Voyager 2, by contrast, appears to be nearing the termination shock, the boundary that precedes the heliosphere.

Illustration courtesy NASA/Wilt Feimer

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