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  2. Penrose diagram - Wikipedia

    en.wikipedia.org/wiki/Penrose_diagram

    Penrose diagram of an infinite Minkowski universe, horizontal axis u, vertical axis v. In theoretical physics, a Penrose diagram (named after mathematical physicist Roger Penrose) is a two-dimensional diagram capturing the causal relations between different points in spacetime through a conformal treatment of infinity.

  3. Olbers's paradox - Wikipedia

    en.wikipedia.org/wiki/Olbers's_Paradox

    The paradox is that a static, infinitely old universe with an infinite number of stars distributed in an infinitely large space would be bright rather than dark. [1] A view of a square section of four concentric shells. To show this, we divide the universe into a series of concentric shells, 1 light year thick.

  4. Shape of the universe - Wikipedia

    en.wikipedia.org/wiki/Shape_of_the_universe

    One of the unanswered questions about the universe is whether it is infinite or finite in extent. For intuition, it can be understood that a finite universe has a finite volume that, for example, could be in theory filled with a finite amount of material, while an infinite universe is unbounded and no numerical volume could possibly fill it.

  5. Kruskal–Szekeres coordinates - Wikipedia

    en.wikipedia.org/wiki/Kruskal–Szekeres_coordinates

    Kruskal–Szekeres diagram, illustrated for 2GM=1. The quadrants are the black hole interior (II), the white hole interior (IV) and the two exterior regions (I and III). The dotted 45° lines, which separate these four regions, are the event horizons. The darker hyperbolas which bound the top and bottom of the diagram are the physical ...

  6. Spacetime diagram - Wikipedia

    en.wikipedia.org/wiki/Spacetime_diagram

    Fig 6-1 Minkowski diagram in an inertial reference frame. On the left, the vertical world line of the falling object. On the right, the hyperbolic world line of the rocket. Fig 6-2 Minkowski diagram in a non-inertial reference frame. On the left, the world line of the falling object. On the right, the vertical world line of the rocket.

  7. Holographic principle - Wikipedia

    en.wikipedia.org/wiki/Holographic_principle

    As the degrees of freedom of a particle are the product of all the degrees of freedom of its sub-particles, were a particle to have infinite subdivisions into lower-level particles, the degrees of freedom of the original particle would be infinite, violating the maximal limit of entropy density. The holographic principle thus implies that the ...

  8. Get orthopedic slide-on shoes up to 50% off during Cyber Monday

    www.aol.com/lifestyle/get-orthopedic-slide-on...

    Kizik makes some of the best shoes our editors have tested for those who have arthritic feet.The Kizik Athens are easy to slide into and have the love of more than 2,500 reviewers. And during ...

  9. Conformal cyclic cosmology - Wikipedia

    en.wikipedia.org/wiki/Conformal_cyclic_cosmology

    Conformal cyclic cosmology (CCC) is a cosmological model in the framework of general relativity and proposed by theoretical physicist Roger Penrose. [1] [2] [3] In CCC, the universe iterates through infinite cycles, with the future timelike infinity (i.e. the latest end of any possible timescale evaluated for any point in space) of each previous iteration being identified with the Big Bang ...