A dinosaur skeleton in a spacesuit.
The truth is out there
A teapot in orbit around the sun somewhere between Earth and Mars.
Or a vase of petunias and a blue whale skeleton?
That manhole cover from Operation Plumbbob.
Gonna steal an idea from Karl Pilkington and leave a dishwasher somewhere on Mars for one of the rovers to find.
“YOU ARE HERE” map.
Everything is already in space. Also, whale songs
Arts and Humanities research.
A paper floating in space that reads ‘Probing the ‘Other’: Conceptions of Zipzorpian-Terran Relations in Early Explorer Narratives’
A single protein molecule.
Something subtle enough to spark debate and controversy but not overplaying it like putting an entire living thing from Earth would be.
I’d suggest 35,000 low-earth-orbit satellites but Elon is already working on that.
Sprinkle some water on the moon
Ghosts
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Dark matter, duh.