Big Bang theory

  • Early observation

    Early observation
    Vesto Slipher determined that most spiral galaxies were receding from Earth.
  • General Relativity support

    General Relativity support
    In Einstein's General Relativity establish and it was found to admit no static cosmological solutions, in Big Bang's theoretical underpinning, the universe was either expanding or shrinking.
  • Idea of universe expansion

    Idea of universe expansion
    The idea of an expanding universe began when American astronomer Edwin Hubble began observing the phenomenon known as redshift.
  • General relativity applied

    General relativity applied
    Russian mathematician Alexander Friedmann derived the expanding-universe solution to general relativity field equations.
  • FLRW

    Alexander Friedmann used Friedmann equations to describe the Friedmann–Lemaitre–Robertson–Walker (FLRW) universe.
  • Expanding model for universe

    Belgian astronomer and cosmologist Georges Lemaitre first proposed the expanding model for the universe to explain the observed redshifts of spiral nebulae.
  • Red-shift

    Edwin Hubble concluded that the universe was expanding calculated from their observed red-shift.
  • Hubble's Law

    Hubble and Milton Humason formulated the empirical Redshift Distance Law of galaxies--The Hubble's Law
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    The Great Depression

    The war had provided a stimulus for industry and for economic activity in general. The collapse of the global economic system in 1929.
  • The Early Big Bang

    The Early Big Bang
    Lemaître proposed in his hypothesis of the primeval atom that the universe began with the "explosion" of the "primeval atom" – what was later called the Big Bang.
  • Primordial atom

    Georges Éduard Lemaître imagine the early universe was extremely dense, He proposed the idea that the universe began with this explosion, called the "primordial atom."
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    Second World War

    The impact of the Second World War cancelled all the plans for the science investigations and experiments, engrossed everything into the field of weapon and war.
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    The Space Race in the Cold War

    The most advanced two countries started their own competition in the space. During the time, the development of the astronomy and the attentions and assistances of the military was highly increased. The fastest development in the 20th century happened.
  • First idea of Big Bang

    Gamow was the first to establish the idea of the Hot Big Bang, which is the idea close to Big Bang.
  • Universe Radiation

    Universe Radiation
    The remnant cosmic background radiation from the explosion discovered and detailed observation provided by Arno Penzias and Robert Woodrow Wilson.