Fun little bit of trivia: those slots in the wheels are Morse code, and they spell out "JPL." The original design had the letters JPL emblazoned on the wheels b

Fun little bit of trivia: those slots in the wheels are Morse code, and they spell out "JPL." The original design had the letters JPL emblazoned on the wheels but they felt this was a little too tooting-your-own-horn, so they made them Morse code instead.[0] 0. Personal communication from MSL engineer