Nanodust Cloud Shrouding the Moon Is Spawned by Meteoroid Impacts

The moon is shrouded by an unstable cloud of "nanodust" kicked up by cosmic impacts, and lit up by sunlight, a new study finds. Similar clouds of teeny dust particles may envelop other airless bodies, researchers say. Airless space objects such as the moon are surrounded by tenuous layers known as exospheres, which are made of particles gravitationally bound to those bodies.