Im always curious how we will send messages to future civilizations. How will we ensure we’ll be remembered or even noted in 10,000, 100,000, 1 million years? How can we prevent the same disaster(s) that eventually wipes our civilisation out from repeating again in future intelligent generations (human or otherwise)
Could environmental markers like these be the way? After all, it’s how we look at the past today
This reminds me of Whisper, one of my favorite exotic alien concepts. The alien civilization in question has selected a planet with as stable environment as possible, and planted it full of genetically engineered grass. The sound of wind blowing through the grass creates an acoustic computer which hosts a virtual space its creators have uploaded themselves into.
A SF short story about a biologically encoded message from ancient aliens (written by one of the Autodesk founders):
We'll Return, After This Message by John Walker
It's fascinating that in 1983 it was thought that a 768-bit RSA number would take 40 million years to factor. (It actually took 26 - RSA-768 was factored in 2009.)
Or directly encode the message in DNA itself. I suppose the difficulty would be devising an encoding with enough redundancy or other features to preserve the information content over many generations of evolutionary pressures.
If by "stay" you mean spread microplatisc, that carries no information, then maybe. The jury is still out, but it looks like it'll last a long time.
But plastic is not a good candidate to hold messages for a long time. It degrades in a few years into some unusable stuff. Glass is a much better candidate.
Deep Time: How Humanity Communicates Across Millennia Paperback by Gregory Benford explores some of those questions. It comes into practical questions when trying to mark nuclear waste dumps.
The problem with that is, judging by our own behavior, an unknown ancient structure makes humans investigate it, try to dig it up, etc. Placing a marker isn't the problem, the hard part is communicating "nothing interesting, only death here, do not enter" in a way that someone in 10.000 years will heed the warning.
The solution is to build them everywhere and put the bad stuff in one of them. If you build enough then the chances of them excavating the one with nuclear waste is pretty low.
Could environmental markers like these be the way? After all, it’s how we look at the past today