For those of you currently planning extraterrestrial trips, check out Alexander Avtanski‘s well-documented Mars Clock project. Built with a modem enclosure and other spare parts, the clock can tell time on any number of planets based on their rotation period. And if you’re organizing a Mars-based marathon, Alexander has you covered: the clock is capable of keeping 16 independent timers. To use his own words, it’s “high on the geekness scale,” which I, for one, always appreciate. [via Dangerous Prototypes]