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Right now the Voyagers, the Voyager spacecraft, are punching through the boundaries of the heliosphere. I’m heavily involved with understanding what’s going on there. That’s going to last another decade I think. There’s still enough radioactive power on those things that they’ll be sending data back. We’re right at the farthest we’ve ever been and there’s new stuff; we’ve found new things out there. The boundaries of the heliosphere—actually the Sun carves out a spherical bubble of interstellar gas and it has a certain size. Now Voyager going through that boundary. So we know that size for the first time, and we know the very beginning to actually understand that phenomenon.
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