video: In October 2017, The Lunar Reconnaissance Orbiter celebrates 100 lunar days of being at the Moon. Part 1 of this video series helps explain what a 'lunar day' is, and what it means for the spacecraft's mission to have been at the Moon for this period of time. Download: https://svs.gsfc.nasa.gov/12739 view more
Credit: NASA's Goddard Space Flight Center/David Ladd