Difference between revisions of "Lava Tubes"
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For her doctoral thesis under advisor B. Ray Hawke at the University of Hawaii, Cassandra Coombs scoured [[Lunar Orbiter]] photographs to identify a number of likely sites for lunar lavatubes. Due to the limiting resolution of the images, only the largest candidates could be identified. It is likely there are many smaller lavatubes in the identified areas and elsewhere. Smaller, but still large by human scale.<ref>Coombs, C.R., and B.R. Hawke, "A Search for Intact Lava Tubes on the Moon: Possible Lunar Base Habitats", in '''''The Second Conference on Lunar Bases and Space Activities of the 21st Century''''', W.W. Mendell, ed., NASA CP-3166, v. 1, p. 219, 1992.</ref> | For her doctoral thesis under advisor B. Ray Hawke at the University of Hawaii, Cassandra Coombs scoured [[Lunar Orbiter]] photographs to identify a number of likely sites for lunar lavatubes. Due to the limiting resolution of the images, only the largest candidates could be identified. It is likely there are many smaller lavatubes in the identified areas and elsewhere. Smaller, but still large by human scale.<ref>Coombs, C.R., and B.R. Hawke, "A Search for Intact Lava Tubes on the Moon: Possible Lunar Base Habitats", in '''''The Second Conference on Lunar Bases and Space Activities of the 21st Century''''', W.W. Mendell, ed., NASA CP-3166, v. 1, p. 219, 1992.</ref> | ||
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==Habitat== | ==Habitat== | ||
Revision as of 10:49, 12 January 2012
Lavatubes are good candidates for habitats on the Moon because they are ready made structures with dozens of meters of solid basalt shielding. In addition to radiation shielding, these environments are also thermally stable (estimated temperature -20° Celsius / -4° Fahrenheit). Lightweight, compact inflatables can be used at first to provide habitable space. Eventually, It should be possible to seal cracks in the lavatube walls to provide an airtight, shirt-sleeve environment. Some lunar lavatubes may be large enough to contain small cities. Living in a lavatube provides many advantages.
Contents
Benefits
- There is substantual shielding due to having several meters of solid basalt between you and the outside. This is good against micrometerorites and radiation.
- There is heat insulation because you are underground.
Size
A 1969 paper by Oberbeck, Quaide, and Greeley, taking into account only the Moon's lighter gravity, and not the stronger nature of lunar anhydrous glass,[1] calculated lunar lavatubes could reach 340 meters in span (lengths could go to kilometers).[2] There are some indications in Coombs and Hawke's work (see "Locations" below) that some lavatubes may be much larger.
Locations
For her doctoral thesis under advisor B. Ray Hawke at the University of Hawaii, Cassandra Coombs scoured Lunar Orbiter photographs to identify a number of likely sites for lunar lavatubes. Due to the limiting resolution of the images, only the largest candidates could be identified. It is likely there are many smaller lavatubes in the identified areas and elsewhere. Smaller, but still large by human scale.[3]
A piece of eurdition unlike any other!
Habitat
As early as 1957, the prescient Robert A. Heinlein described people living and working in giant volcanic voids in the Moon (although they were large bubbles rather than lavatubes). In the 1976 second edition of Depths of the Earth, speleologist William R. Halliday suggests large lavatube caves may exist on the Moon and Mars, and "mankind may look to these. . .caves for ultimate survival." NASA "experimental planetologist" Friedrich Hörz finally put it all together in his 1985 paper, "Lava Tubes: Potential Shelters for Habitats". Oregon L5 Society expanded on this work, holding analog exercises in lavatube caves with Young Astronauts and filling-in research topics such as "Lavatube Entrance Amelioration on the Moon and Mars" and "Moon Lighting: Illumination for Lunar Base Construction and Operations". Their multi-year effort to publicize and bring the lavatube option to the attention of NASA and space development enthusiasts in general has been effective.[4][5]
Oregon L5 Society papers can be found at http://www.OregonL5.org/
- ↑ Blacic, J.D., "Mechanical Properties of Lunar Materials Under Anhydrous, Hard Vacuum Conditions: Applications of Lunar Glass Structural Components", in Lunar Bases and Space Activities of the 21st Century, W.W. Mendell, ed., Houston, Lunar and Planetary Institute, p. 487, 1985.
- ↑ Oberbeck, V.R., W.L. Quaide and R.G. Greeley, "On the Origin of Lunar Sinuous Rilles", Modern Geology, v. 1, p. 75, 1969.
- ↑ Coombs, C.R., and B.R. Hawke, "A Search for Intact Lava Tubes on the Moon: Possible Lunar Base Habitats", in The Second Conference on Lunar Bases and Space Activities of the 21st Century, W.W. Mendell, ed., NASA CP-3166, v. 1, p. 219, 1992.
- ↑ Heinlein, Robert A., "The Menace from Earth", in collection The Menace From Earth, Signet, pp. 92-115, 1962 (orig. story copyright ©1957).
- ↑ Halliday, William R., M.D., Depths of the Earth, Revised and Enlarged Edition, Harper & Row, pp. 377-397, 1976.
