[ProtectOurFreedom]

A “nuclear tunnelbot” — sounds like the end of the world is nigh.

[Flick Lives]

A “nuclear tunnelbot” — sounds like the end of the world is nigh.

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All deep space / long term probes requires a lump of nuclear material (plutonium) to provide an energy source. Voyager 1 and 2 used plutonium. As did Cassini, Curiosity, and New Horizons.