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  2. Artificial gravity - Wikipedia

    en.wikipedia.org/wiki/Artificial_gravity

    Artificial gravity is the creation of an inertial force that mimics the effects of a gravitational force, usually by rotation. [1] Artificial gravity, or rotational gravity, is thus the appearance of a centrifugal force in a rotating frame of reference (the transmission of centripetal acceleration via normal force in the non-rotating frame of ...

  3. McKendree cylinder - Wikipedia

    en.wikipedia.org/wiki/McKendree_cylinder

    A McKendree cylinder is a type of hypothetical rotating space habitat originally proposed at NASA 's Turning Goals into Reality conference in 2000 by NASA engineer Tom McKendree. [1] Like other space habitat designs, the cylinder would spin to produce artificial gravity by way of centrifugal force. The design differs from the classical designs ...

  4. Gravitoelectromagnetism - Wikipedia

    en.wikipedia.org/wiki/Gravitoelectromagnetism

    Diagram regarding the confirmation of gravitomagnetism by Gravity Probe B. Gravitoelectromagnetism, abbreviated GEM, refers to a set of formal analogies between the equations for electromagnetism and relativistic gravitation; specifically: between Maxwell's field equations and an approximation, valid under certain conditions, to the Einstein field equations for general relativity.

  5. Conservation and restoration of waterlogged wood - Wikipedia

    en.wikipedia.org/wiki/Conservation_and...

    Waterlogged wood is a wooden object that has been submerged or partially submerged in water and has affected the original intended purpose or look of the object. . Waterlogged wood objects can also include wood found within moist soil from archaeological sites, underwater archaeology, maritime debris, or damaged w

  6. Space settlement - Wikipedia

    en.wikipedia.org/wiki/Space_settlement

    A Stanford torus interior (cutaway view) Interior view of a large scale O'Neill cylinder, showing alternating land and window stripes. A space settlement (also called a space habitat, spacestead, space city or space colony) is a settlement in outer space, sustaining more extensively habitation facilities in space than a general space station or spacecraft.

  7. Terraforming - Wikipedia

    en.wikipedia.org/wiki/Terraforming

    Terraforming. An artist's conception shows a terraformed Mars in four stages of development. Terraforming or terraformation ("Earth-shaping") is the hypothetical process of deliberately modifying the atmosphere, temperature, surface topography or ecology of a planet, moon, or other body to be similar to the environment of Earth to make it ...

  8. Bernal sphere - Wikipedia

    en.wikipedia.org/wiki/Bernal_sphere

    Example layout for an Island One-type Bernal sphere. In a series of studies held at Stanford University in 1975 and 1976 with the purpose of speculating on designs for future space colonies, Dr. Gerard K. O'Neill proposed Island One, a modified Bernal sphere with a diameter of only 500 m (1,600 ft) rotating at 1.9 RPM to produce a full Earth artificial gravity at the sphere's equator.

  9. Gravitational interaction of antimatter - Wikipedia

    en.wikipedia.org/wiki/Gravitational_interaction...

    The CPT theorem implies that the difference between the properties of a matter particle and those of its antimatter counterpart is completely described by C-inversion. Since this C-inversion does not affect gravitational mass, the CPT theorem predicts that the gravitational mass of antimatter is the same as that of ordinary matter. [5]