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  2. Big Bang - Wikipedia

    en.wikipedia.org/wiki/Big_Bang

    The earliest and most direct observational evidence of the validity of the theory are the expansion of the universe according to Hubble's law (as indicated by the redshifts of galaxies), discovery and measurement of the cosmic microwave background and the relative abundances of light elements produced by Big Bang nucleosynthesis (BBN).

  3. Cosmogony - Wikipedia

    en.wikipedia.org/wiki/Cosmogony

    The Big Bang theory, which explains the Evolution of the Universe from a hot and dense state, is widely accepted by physicists.. In astronomy, cosmogony is the study of the origin of particular astrophysical objects or systems, and is most commonly used in reference to the origin of the universe, the Solar System, or the Earth–Moon system.

  4. Nebular hypothesis - Wikipedia

    en.wikipedia.org/wiki/Nebular_hypothesis

    The theory was developed by Immanuel Kant and published in his Universal Natural History and Theory of the Heavens (1755) and then modified in 1796 by Pierre Laplace. Originally applied to the Solar System, the process of planetary system formation is now thought to be at work throughout the universe.

  5. Timeline of cosmological theories - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_cosmological...

    Aryabhatta puts forward the theory of rotation of the Earth in its own axis and explained day and night was caused by the diurnal rotation of the Earth. He models a geocentric universe with the sun, moon, and planets following circular and eccentric orbits with epicycles. [48] 5th century – The Jewish talmud gives an argument for finite ...

  6. Physical cosmology - Wikipedia

    en.wikipedia.org/wiki/Physical_cosmology

    Physical cosmology is a branch of cosmology concerned with the study of cosmological models. A cosmological model, or simply cosmology, provides a description of the largest-scale structures and dynamics of the universe and allows study of fundamental questions about its origin, structure, evolution, and ultimate fate. [1]

  7. Pythagorean astronomical system - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_astronomical...

    A flat Earth facing away from the Central Fire would be consistent with the pre-gravity concept that if all things must fall toward the center of the universe, this force would allow the earth to revolve around the center without spilling everything on the surface into space. [5]

  8. Astronomers Found the Ancient Light Source That Literally ...

    www.aol.com/astronomers-found-ancient-light...

    It highlights the importance of understanding low-mass galaxies in shaping the Universe's history.” Detecting these ultra-faint galaxies is no easy feat—in fact, it required the $10 billion ...

  9. Luminiferous aether - Wikipedia

    en.wikipedia.org/wiki/Luminiferous_aether

    Luminiferous aether or ether [1] (luminiferous meaning 'light-bearing') was the postulated medium for the propagation of light. [2] It was invoked to explain the ability of the apparently wave-based light to propagate through empty space (a vacuum), something that waves should not be able to do. The assumption of a spatial plenum (space ...