We spent $2.5 billion to put Helvetica Arial on Mars (and incidentally, an SUV-sized robotic science rover), and yet not a cent was devoted to kerning. The Curiosity rover carries a calibration target for its Mars Hand Lens Imager (MAHLI), an adjustable focus camera designed to take close-up pictures. It's one of 17 cameras on the rover, but it's the only one that has its own target for testing a photo against known colors, brightness, and scale. (​Update: ​The sundial on top of the rover has color swatches for the mast cameras.)

But as a former typesetter, I had to poke fun at the kerning in the word "Target", where the "a" in any design software would be neatly tucked underneath the "T". NASA is old-school in type, too, as this is Helvetica, not Helvetica Neue.​ (Update! Readers note this is Arial, as the angle terminators on the upper-case C give it away! Go, go, Microsoft fonts!)

The calibration target includes a 1909 penny as a homage to the practice of using a coin for scale in images. One of the scientists bought the penny from the first year Lincoln appeared on its front, and sent it on its merry mission. The target is now lightly dusted with Martian soil, but still useful for its purpose.

A full size image is available from NASA.