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  2. Universe - Wikipedia

    en.wikipedia.org/wiki/Universe

    The observable universe is isotropic on scales significantly larger than superclusters, meaning that the statistical properties of the universe are the same in all directions as observed from Earth. The universe is bathed in highly isotropic microwave radiation that corresponds to a thermal equilibrium blackbody spectrum of roughly 2.72548 ...

  3. Observable universe - Wikipedia

    en.wikipedia.org/wiki/Observable_universe

    Because of the universe's expansion, there may be some later age at which a signal sent from the same galaxy can never reach the Earth at any point in the infinite future, so, for example, we might never see what the galaxy looked like 10 billion years after the Big Bang, [19] even though it remains at the same comoving distance less than that ...

  4. Expansion of the universe - Wikipedia

    en.wikipedia.org/wiki/Expansion_of_the_universe

    The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. [1] It is an intrinsic expansion, so it does not mean that the universe expands "into" anything or that space exists "outside" it.

  5. List of largest stars - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_stars

    Luminous red novae appear to expand extremely rapidly, reaching thousands to tens of thousands of solar radii within only a few months, significantly larger than the largest red supergiants. [ 2 ] Some studies use models that predict high-accreting Population III or Population I supermassive stars (SMSs) in the very early universe could have ...

  6. List of largest cosmic structures - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_cosmic...

    It is the most massive galaxy supercluster discovered so far. [19] Big Ring (2024) 1,300,000,000 Made up of galaxy clusters. Quipu (2025) 1,300,000,000 Contains 68 galaxy clusters. [20] (Theoretical limit) 1,200,000,000 Structures larger than this size are incompatible with the cosmological principle according to all estimates. However, whether ...

  7. The universe is getting hotter as it gets older — here’s why

    www.aol.com/universe-getting-hotter-gets-older...

    The cosmic web — ribbons of gas and dust tying galaxies together — are the largest structures in the Universe, and a new study shows they are growing hotter over time.

  8. Shape of the universe - Wikipedia

    en.wikipedia.org/wiki/Shape_of_the_universe

    Different mathematical models of the universe's global geometry can be constructed, all consistent with current observations and general relativity. Hence, it is unclear whether the observable universe matches the entire universe or is significantly smaller, though it is generally accepted that the universe is larger than the observable universe.

  9. Big Bang - Wikipedia

    en.wikipedia.org/wiki/Big_Bang

    During inflation, the universe undergoes exponential expansion, and the particle horizon expands much more rapidly than previously assumed, so that regions presently on opposite sides of the observable universe are well inside each other's particle horizon. The observed isotropy of the CMB then follows from the fact that this larger region was ...