We wish these NASA recruitment posters for Martian workers were real. Alas, we've yet to send humans to the red planet, and these were but part of an art exhibit at the Kennedy Space Center Visitor's Complex in 2009. While you can't work as a technician, a teacher, a surveyor or as a farmer on Mars at this point in time, you can at least download high-res copies of these posters today. The space agency has made them all available on its website, in case you want to print them out for your walls or to use them as wallpapers on your phone. If you're still feeling a bit miffed that you can't actually go to Mars, well, just think of Mark Watney and be thankful that there's zero chance you'll get left behind on an alien planet.