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Beneath the surface of the moon can be a huge cave
Example of a possible lava tube i>
Theoretical study data on the structure of the Moon received during the recent space mission NASA, admits the possibility of under its huge surface лавовых tubes with diameter up to several kilometers. These natural cavities can serve as a reliable shelter from radiation, meteorites and temperature changes for future lunar settlements. work was presented May 17 at a conference to explore the Moon and planets .
Mission GRAIL took place in 2012. Two artificial lunar satellite investigated its gravitational field and internal structure. According to the research, for example, it was found that the thickness of the lunar crust is only about 30 miles - much less than previously thought.
In his thesis work graduate of the American University Purdue conducted theoretical studies and found that the results of measurements GRAIL perfectly consistent with the existence of voids beneath the surface of the moon with a diameter of 1-2 kilometers. Outputs of voids on the surface of 100 m in diameter were found in the earlier observations. Due to the low gravity and lack of natural erosion, the maximum diameter of a stable lunar caves can reach 5 km. If these caves are found, they will be a perfect place to start colonization of the Moon.
Source: geektimes.ru/post/247630/