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Voyager 1 loses contact with NASA, turns on retro transmitter not used since 1981
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The Busy Center of the Lagoon Nebula
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In case you're wondering, the correct substance is graphite powder
Yep, I had completely forgotten about graphite because I was looking at my 3-in-1 oil at the time. My mistake, and I'm leaving it to show my own hubris and blind spots, much like the Texan pictured above.