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  2. Static universe - Wikipedia

    en.wikipedia.org/wiki/Static_universe

    In cosmology, a static universe (also referred to as stationary, infinite, static infinite or static eternal) is a cosmological model in which the universe is both spatially and temporally infinite, and space is neither expanding nor contracting. Such a universe does not have so-called spatial curvature; that is to say that it is 'flat' or ...

  3. Einstein's static universe - Wikipedia

    en.wikipedia.org/wiki/Einstein's_static_universe

    Einstein's static universe, aka the Einstein universe or the Einstein static eternal universe, is a relativistic model of the universe proposed by Albert Einstein in 1917. [ 1 ] [ 2 ] Shortly after completing the general theory of relativity , Einstein applied his new theory of gravity to the universe as a whole.

  4. Cosmology - Wikipedia

    en.wikipedia.org/wiki/Cosmology

    The Hubble eXtreme Deep Field (XDF) was completed in September 2012 and shows the farthest galaxies ever photographed at that time. Except for the few stars in the foreground (which are bright and easily recognizable because only they have diffraction spikes), every speck of light in the photo is an individual galaxy, some of them as old as 13.2 billion years; the observable universe is ...

  5. Shape of the universe - Wikipedia

    en.wikipedia.org/wiki/Shape_of_the_universe

    A "closed universe" is necessarily a closed manifold. An "open universe" can be either a closed or open manifold. For example, in the Friedmann–Lemaître–Robertson–Walker (FLRW) model, the universe is considered to be without boundaries, in which case "compact universe" could describe a universe that is a closed manifold.

  6. Static spacetime - Wikipedia

    en.wikipedia.org/wiki/Static_spacetime

    Thus, the Kerr solution provides an example of a stationary spacetime that is not static; the non-rotating Schwarzschild solution is an example that is static. Formally, a spacetime is static if it admits a global, non-vanishing, timelike Killing vector field which is irrotational, i.e., whose orthogonal distribution is involutive.

  7. 30 Examples Of Surrealism Art That Might Make It Your ...

    www.aol.com/lifestyle/30-examples-surrealism-art...

    Image credits: surrealism.world Today's list is also full of contemporary surrealist creations. The pictures were collected and shared by Instagram page @surrealism.world, which currently has over ...

  8. Cosmological constant - Wikipedia

    en.wikipedia.org/wiki/Cosmological_constant

    The cosmological constant was originally introduced in Einstein's 1917 paper entitled “The cosmological considerations in the General Theory of Reality”. [2] Einstein included the cosmological constant as a term in his field equations for general relativity because he was dissatisfied that otherwise his equations did not allow for a static universe: gravity would cause a universe that was ...

  9. Cosmological horizon - Wikipedia

    en.wikipedia.org/wiki/Cosmological_horizon

    Due to the expansion of the universe, it is not simply the age of the universe times the speed of light, as in the Hubble horizon, but rather the speed of light multiplied by the conformal time. The existence, properties, and significance of a cosmological horizon depend on the particular cosmological model.