lunar caves discovered underground Lunar lava tubes Marius Hills mooncave

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Lunar lava tubes are sub-surface tunnels on the Moon that are believed to have formed during basaltic lava flows. When the surface of a lava tube cools, it forms a hardened lid that contains the ongoing lava flow beneath the surface in a conduit-shaped passage. Once the flow of lava diminishes, the tunnel may become drained, forming a hollow void. Lunar lava tubes are formed on surfaces that have a slope that ranges in angle from 0.4–6.5°. Lunar lava 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. https://en.wikipedia.org/wiki/Lunar_l... • The hole, first discovered by the Japanese SELenological and ENgineering Explorer (SELENE) and then later imaged by the Lunar Reconnaissance Orbiter[8] has been the subject of much research and speculation. There is a possibility that this feature could be a skylight in an underground lava tube. The depth of this hole is estimated to be between 80 and 88 m (262 and 289 ft) and its width is estimated to be several hundreds of meters. https://en.wikipedia.org/wiki/Marius_... • Observation data collected by Japan’s lunar orbiter Kaguya has shown that a cave stretching some 50 km (over 30 miles) exists on the moon that could provide shelter for astronauts in the future, the Japan Aerospace Exploration Agency said Wednesday. • The cave could protect astronauts from radiation from the sun and cosmic rays when they build a base for exploration, the agency said. • The cave, believed to be a lava tube created about 3.5 billion years ago, sits beneath an area with a group of volcanic domes called the Marius Hills, it said. • https://en.wikipedia.org/wiki/SELENE • http://global.jaxa.jp/projects/sat/se... • http://global.jaxa.jp/article/special... • The lunar orbiter initially found a hole about 50 meters in diameter and depth. Further surveys of the area with radio waves discovered the lava tube, the agency, also known as JAXA, said. https://www.voanews.com/a/nasa-delays...

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