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  2. Observable universe - Wikipedia

    en.wikipedia.org/wiki/Observable_universe

    The observable universe contains as many as an estimated 2 trillion galaxies [36] [37] [38] and, overall, as many as an estimated 10 24 stars [39] [40] – more stars (and, potentially, Earth-like planets) than all the grains of beach sand on planet Earth.

  3. Eddington number - Wikipedia

    en.wikipedia.org/wiki/Eddington_number

    He related α to the Eddington number, which was his estimate of the number of protons in the universe. [1] This led him in 1929 to conjecture that α was exactly 1/136. [2] He devised a "proof" that N Edd = 136 × 2 256, or about 1.57 × 10 79. Other physicists did not adopt this conjecture and did not accept his argument. [citation needed]

  4. Multiverse - Wikipedia

    en.wikipedia.org/wiki/Multiverse

    There are models of two related universes that e.g. attempt to explain the baryon asymmetry – why there was more matter than antimatter at the beginning – with a mirror anti-universe. [78] [79] [80] One two-universe cosmological model could explain the Hubble constant (H 0) tension via interactions between the two worlds. The "mirror world ...

  5. James Webb Space Telescope - Wikipedia

    en.wikipedia.org/wiki/James_Webb_Space_Telescope

    The secondary mirror is 0.74 m (2.4 ft) in diameter. In addition, there is a fine steering mirror which can adjust its position many times per second to provide image stabilization. Point light sources in images taken by Webb have six diffraction spikes plus two fainter ones, due to the hexagonal shape of the primary mirror segments. [42]

  6. List of largest cosmic structures - Wikipedia

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

    Discovered through gamma-ray burst mapping. Largest-known regular formation in the observable universe. [8] Huge-LQG (2012–2013) 4,000,000,000 [9] [10] [11] Decoupling of 73 quasars. Largest-known large quasar group and the first structure found to exceed 3 billion light-years. "The Giant Arc" (2021) 3,300,000,000 [12] Located 9.2 billion ...

  7. Mission to study the ‘dark side’ of the universe just ...

    www.aol.com/euclid-telescope-creating-largest-3d...

    The European Space Agency’s Euclid telescope aims to create the largest 3D map of the universe in the next six years. The observatory just completed the first piece.

  8. List of voids - Wikipedia

    en.wikipedia.org/wiki/List_of_voids

    Voids are particularly galaxy-poor regions of space between filaments, making up the large-scale structure of the universe. Some voids are known as supervoids . In the tables, z is the cosmological redshift , c the speed of light , and h the dimensionless Hubble parameter , which has a value of approximately 0.7 (the Hubble constant H 0 = h × ...

  9. Hubble Space Telescope - Wikipedia

    en.wikipedia.org/wiki/Hubble_Space_Telescope

    Many Hubble observations have led to breakthroughs in astrophysics, such as determining the rate of expansion of the universe. Space telescopes were proposed as early as 1923, and the Hubble telescope was funded and built in the 1970s by the United States space agency NASA with contributions from the European Space Agency .