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What? Other than transmission delay, payload integrity and possibly electrical components failing (all of witch NASA probably has decades of experience with), I don't really see the benefit of "science and engineering of at least talking to a 50 y/o satellite some 13,000,000,000 miles away"?

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They still have scientific instruments operating. These have produced new insight into the last few years, telling us e.g. how large the Heliosphere is. The investment needed to find this out with a new drone would be astronomical (heh) whereas using the existing tools is basically free.

By simply measuring radio data they measured the size of solar system and density around it. super important subject for future Interstellar travel. same with temperature and radiation levels

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