Carve it into extremely hard rock, encase that in Lucite, and put it on the surface of the moon.Unless hit by a meteor, it should last millions of years.Look at Nazca...they scratch some line in the soil, and they're still stumping modern man after? ...an unknown number of years.The reliefs carved in Egyptian obelisks are still sharp, after ??? an unknown number of years, so any deep etching in granite or andesite would last. Or carve it into porcelain...that's supposed to last many eons...or encase it in our most durable plastic, and place it in orbit. If something doesn't have erosion to deal with (water or air/dust storms), images will last indefinitely. Look at the stones from Puma Punko, Teohaunico, or Sacsayhaunan...unknown age, still sharp and precise, and subjected to erosion...?
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