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  2. Big Bang - Wikipedia

    en.wikipedia.org/wiki/Big_Bang

    The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The concept of an expanding universe was scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.

  3. A Brief History of Time - Wikipedia

    en.wikipedia.org/wiki/A_Brief_History_of_Time

    Most scientists agree that the universe began in an expansion called the "Big Bang". At the start of the Big Bang, the universe had an extremely high temperature, which prevented the formation of complex structures like stars, or even very simple ones like atoms. During the Big Bang, a phenomenon called "inflation" took place, in which the ...

  4. Hartle–Hawking state - Wikipedia

    en.wikipedia.org/wiki/Hartle–Hawking_state

    According to the Hartle–Hawking proposal, the universe has no origin as we would understand it: before the Big Bang, which happened about 13.8 billion years ago, the universe was a singularity in both space and time. Hartle and Hawking suggest that if we could travel backwards in time towards the beginning of the universe, we would note that ...

  5. 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 ...

  6. Robert Jastrow - Wikipedia

    en.wikipedia.org/wiki/Robert_Jastrow

    The Big Bang theory and the argument from design. Second edition contains appendices with Roman Catholic and Jewish perspectives. The Enchanted Loom: Mind in the Universe (1981) Simon & Schuster hardcover: ISBN 0-671-43308-3, Touchstone 1983 paperback: ISBN 0-671-47068-X, Oxford Univ Press 1993 paperback: ISBN 88-435-3349-5. The evolution of ...

  7. Stephen Hawking: 'Human race has no future' without space travel

    www.aol.com/news/2016-09-27-stephen-hawking...

    Stephen Hawking is a supporter of space travel, in part, because he thinks the survival of humanity depends on it. Hawking shared these thoughts in an afterword for Julian Guthrie's book "How to ...

  8. Stephen Hawking - Wikipedia

    en.wikipedia.org/wiki/Stephen_Hawking

    Stephen Hawking and the Theory of Everything (2007) Stephen Hawking: Master of the Universe (2008) [431] Into the Universe with Stephen Hawking (2010) [432] Brave New World with Stephen Hawking (2011) [433] Stephen Hawking's Grand Design (2012) [434] The Big Bang Theory (2012, 2014–2015, 2017) Stephen Hawking: A Brief History of Mine (2013) [435]

  9. Cosmological constant - Wikipedia

    en.wikipedia.org/wiki/Cosmological_constant

    The cosmological constant was originally introduced in Einstein's 1917 paper entitled “The cosmological considerations in the General Theory of Reality”. [2] Einstein included the cosmological constant as a term in his field equations for general relativity because he was dissatisfied that otherwise his equations did not allow for a static universe: gravity would cause a universe that was ...

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