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It’s not remarkable they keep flying. They’re in space, just moving along their vector.
It is remarkable they keep operating though.
46 years of radiation, dust, and passing through the heliopause makes it pretty amazing that it’s still flying and not an irradiated ball of welding spatter.
Space is super empty. Not hitting anything that would change its path or physically destroy isn’t that wild.
Most stuff destroyed by time on earth is erosion or microbial breakdown, which isn’t an issue in space.
