lunar lava tube

Lunar lava tubes are lava tubes on the Moon formed during the eruption of basaltic lava flows. When the surface of a lava flow cools, it hardens and the lava can channel beneath the surface in a tube-shaped passage. Once the flow of lava diminishes, the tube may drain, forming a hollow void. Lunar lava tubes are formed on sloped surfaces that range in angle from 0.4° to 6.5°. These tubes may be as wide as 500 metres (1,600 ft) before they become unstable against gravitational collapse. However, stable tubes may still be disrupted by seismic events or meteoroid bombardment.

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lava tube, subterranea, 

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lava tube, subterranea, 

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Location: KML, Cluster Map, Maps,

Frameless

What lies beneath the lunar surface? DVIDS832714

Mare Ingenii presumed lava tube skylight

Lunar collapse pits

Sinuous chain of collapse pits transitioning into a continuous uncollapsed segment of a lunar lava tube.

Type	Subtype	Date	Description	Notes	Source
commons	image		What lies beneath the lunar surface? DVIDS832714		Commons
commons	image		Mare Ingenii presumed lava tube skylight		Commons
commons	image		Lunar collapse pits		Commons
commons	image		Sinuous chain of collapse pits transitioning into a continuous uncollapsed segment of a lunar lava tube.		Commons