NASA is kind of awesome. In case you live under some red rocks, the organization sent this crazy robot to Mars that sends us back high-resolution photos. The future is amazing. Of course, there's nothing the space administration loves more than curiosity (which is why they named the Mars rover after it), and it's aiming to fuel yours with this 3D model explorer.
In a somewhat odd move, instead of simply providing the 3D models themselves, the app requires you to print out some markers.