Japan's lunar orbiter discovers 50km cave beneath surface Underground chamber can potentially provide shelter for astronauts KENTARO IWAMOTO, Nikkei staff writer TOKYO -- Data from a lunar orbiter has confirmed a cave beneath the surface of the moon that could be used as an exploration base, providing shelter for astronauts and instruments, the Japan Aerospace Exploration Agency, or JAXA, said Wednesday. The lunar orbiter Kaguya, also known as Selene, discovered the tube-shaped, 50km cave by using its radar sounder system that examines underground structures. The cave was found at an area with a set of volcanic domes known as the...