A dinosaur skeleton in a spacesuit.
The truth is out there
That manhole cover from Operation Plumbbob.
A radio station streaming “Baby Shark” on all frequencies
Possibly the most appreciated song on earth.
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 very small probe that emits an impossible to miss signal at random pretty long intervals and then adjusts its orbit to be very different. It would basically pretend to be various Aliens civilizations trying to contact us. Like every 45 days a new signal from a new part of the sky is picked up and then never repeats and if were just getting tons of messages at once. And since the probe is small and doesnt have a predictable orbit it would be very hard to figure out that its actually a probe and then find it.
Alternatively. A plane full of snakes.
Sprinkle some water on the moon
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.
Ghosts
I’d suggest 35,000 low-earth-orbit satellites but Elon is already working on that.
Dark matter, duh.
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