Extensive studies were conducted by the Lunar Orbiter, Clementine, Lunar Prospector, Lunar Reconnaissance Orbiter, Kaguya, and Chandrayaan.
Studii ample au fost efectuate de Lunar Orbiter⁠(en), Clementine⁠(en), Lunar Prospector⁠(en), Lunar Reconnaissance Orbiter⁠(en), Kaguya, și Chandrayaan.