Barbara Cohen is a Planetary Scientist at NASA Goddard Space Flight Center. Her work includes laboratory geochronology (time and earth) to determine when rocks formed. Barbara relies on robots that can travel to places like the Moon and Mars and perform investigations. Plans for travel to the Moon include a possible mission called Lunar Flashlight, where a very small satellite will shine a laser on some of the Moon’s darkest craters in an attempt to look for ice hidden at the Moon’s South Pole.