The Moon’s more than 200 holes, or lunar pits, were discovered by NASA’s Lunar Reconnaissance Orbiter, reports Motherboard. A habitat placed in a pit — ideally several dozen meters back under an overhang — would provide a very safe location for astronauts: no radiation, no micrometeorites, possibly very little dust, and no wild day-night temperature swings, said Robert Wagner, one of the Arizona State University researchers who helped discover the holes, in a statement. Now that NASA has identified these caves, researchers are hoping to explore them.