[twright]

Put it on a rocket and set it up for a 1000 year trajectory that would bring it back to Earth (or simply a local orbit that decays over a millennium). I’ve only played KSP so I’m sure there’s some impossibility in this (could a parachute last that long and remain functional?). The medium of the message is another interesting question for this.

[gtsteve]

Sounds a bit like KEO [0] which was intended to deliver messages back to earth 50,000 years from now. I first heard of it in 2002 but it still hasn't launched and I guess it never will.

[0] https://en.wikipedia.org/wiki/KEO