What is the Moon’s Marius Hills Lava Tube? [STUDY]

In October 2017, the Japanese Space Agency, JAXA, announced their discovery of a 50-kilometer-wide underground lava tube on the Moon. JAXA fired radar into a “skylight” on the Moon’s surface, using The Lunar Radar Sounder onboard Japan’s SELENE/Kaguya orbiter. JAXA astronomers determined that the skylight and other large, non-craterous holes on the lunar surface were entrances to large underground chambers.

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