The Lunar Library: nano-etched civilizational archives of 30m pages, designed to last for billions of years

In 8 billion years it will be immaterial (literally!) but as far as secure spots to stash a comprehensive library, it beats anything on earth, I suspect. You could do better shooting it into interstellar space, or even interplanetary space, but with current tech, this is probably as good as you can get on their budget. I would be interested in how they mark it to draw the High Overlords attention when they get here?

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