Stanford torus

The Stanford torus is a proposed NASA design[1] for a space habitat capable of housing 10,000 to 140,000 permanent residents.[2]

For fictional structures for living in space, see Space stations and habitats in fiction.
Exterior view of a Stanford torus. Bottom center is the non-rotating primary solar mirror, which reflects sunlight onto the angled ring of secondary mirrors around the hub. Painting by Donald E. Davis
Interior of a Stanford torus, painted by Donald E. Davis

The Stanford torus was proposed during the 1975 NASA Summer Study, conducted at Stanford University, with the purpose of exploring and speculating on designs for future space colonies[3] (Gerard O'Neill later proposed his Island One or Bernal sphere as an alternative to the torus[4]). "Stanford torus" refers only to this particular version of the design, as the concept of a ring-shaped rotating space station was previously proposed by Wernher von Braun[5] and Herman Potočnik.[6]

It consists of a torus, or doughnut-shaped ring, that is 1.8 km in diameter (for the proposed 10,000 person habitat described in the 1975 Summer Study) and rotates once per minute to provide between 0.9g and 1.0g of artificial gravity on the inside of the outer ring via centrifugal force.[7]

Sunlight is provided to the interior of the torus by a system of mirrors, including a large non-rotating primary solar mirror.

The ring is connected to a hub via a number of "spokes", which serve as conduits for people and materials travelling to and from the hub. Since the hub is at the rotational axis of the station, it experiences the least artificial gravity and is the easiest location for spacecraft to dock. Zero-gravity industry is performed in a non-rotating module attached to the hub's axis.[8]

The interior space of the torus itself is used as living space, and is large enough that a "natural" environment can be simulated; the torus appears similar to a long, narrow, straight glacial valley whose ends curve upward and eventually meet overhead to form a complete circle. The population density is similar to a dense suburb, with part of the ring dedicated to agriculture and part to housing.[9]

Construction

The torus would require nearly 10 million tons of mass. Construction would use materials extracted from the Moon and sent to space using a mass driver. A mass catcher at L2 would collect the materials, transporting them to L5 where they could be processed in an industrial facility to construct the torus. Only materials that could not be obtained from the Moon would have to be imported from Earth. Asteroid mining is an alternative source of materials.[10]

General characteristics
  • Location: Earth–Moon L5 Lagrangian point
  • Total mass: 10 million tons (including radiation shield (95%), habitat, and atmosphere)
  • Diameter: 1,790 m (1.11 mi)
  • Circumference: 5,623.45 m (3.49 mi)
  • Habitation tube diameter: 130 m (430 ft)
  • Spokes: 6 spokes of 15 m (49 ft) diameter
  • Rotation: 1 revolution per minute
  • Radiation shield: 1.7 meters (5.6 feet) thick raw lunar soil
  • Stanford torus configuration.
  • Stanford torus structural cross section.
  • Transportation system for the torus construction (1975).
  • A torus expanding from interconnected bolas or dumbbells.
  • A NASA lunar base concept with a mass driver (the long structure that extends toward the horizon).
  • External view of a Stanford torus with some of the radiation-shielding "chevron" mirrors removed to show interior space
  • Cutaway view of a Stanford torus.
gollark: I agree.
gollark: ↓ actually unix milliseconds internally
gollark: Minoteaur does this, yes.
gollark: Too bad, use different descriptions for cultural day divisions and actual ones because you basically have to anyway.
gollark: Also hours/minutes, ideally - just use millidays or something.

See also

References
  1. Johnson, Holbrow (1977). "Space Settlements: A Design Study". National Aeronautics and Space Administration.
  2. Johnson. NASA Study, pg 1, "The Overall System", pg 60, Summary
  3. Johnson. NASA Study, pg VII, "Preface"
  4. Gerard K. O'Neil, "The High Frontier", William Morrow & Co., 1977, p149
  5. Von Braun, W.:Crossing the Final Frontier, Colliers, March 22, 1952
  6. Hermann Potočnik: The Problem of Space Travel (1929)
  7. Johnson, NASA study, p46
  8. Johnson. NASA Study, Chap. 5
  9. Johnson. NASA Study, Chap. 5
  10. Johnson, Richard D.; Holbrow, Charles (1977). "Space Settlements: A Design Study" (PDF). NASA Technical Reports Server. p. 201. Retrieved October 20, 2012.
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