I’m on a one-way mission to Mars, but the samples I collect there will be the first things ever to make a round trip. In the search for signs of ancient life on Mars, see how super-clean sample tubes make for super-clean science. https://t.co/icIt9rVe00 #CountdownToMars pic.twitter.com/9DzY9biZEL

— NASA's Perseverance Mars Rover (@NASAPersevere) December 22, 2020