Hubble's law implies that the universe is uniformly expanding everywhere. This cosmic expansion was predicted from general relativity by Friedmann in 1922 [58] and Lemaître in 1927, [61] well before Hubble made his 1929 analysis and observations, and it remains the cornerstone of the Big Bang model as developed by Friedmann, Lemaître, Robertson, and Walker. Ivanchik, Alexandre V.; Potekhin, Alexander Y.; Varshalovich, Dmitry A. (March 1999). "The fine-structure constant: a new observational limit on its cosmological variation and some theoretical consequences". Astronomy & Astrophysics. 343 (2): 439–445. arXiv: astro-ph/9810166. Bibcode: 1999A&A...343..439I.

Big Bang Theory: Behind-the-Scenes Set Photos and Videos The Big Bang Theory: Behind-the-Scenes Set Photos and Videos

As a description of the origin of the universe, the Big Bang has significant bearing on religion and philosophy. [159] [160] As a result, it has become one of the liveliest areas in the discourse between science and religion. [161] Some believe the Big Bang implies a creator, [162] [163] while others argue that Big Bang cosmology makes the notion of a creator superfluous. [160] [164] See also Thursday Finals: 'Big Bang Theory,' 'The X Factor,' 'Parks & Recreation' and 'Whitney' Adjusted Up|publisher=TV by the Numbers While we can understand how the universe we see came to be, it's possible that the Big Bang was not the first inflationary period the universe experienced. Some scientists believe we live in a cosmos that goes through regular cycles of inflation and deflation, and that we just happen to be living in one of these phases. The theory requires the relation v = H D {\displaystyle v=HD} to hold at all times, where D {\displaystyle D} is the proper distance, v is the recessional velocity, and v {\displaystyle v} , H {\displaystyle H} , and D {\displaystyle D} vary as the universe expands (hence we write H 0 {\displaystyle H_{0}} to denote the present-day Hubble "constant"). For distances much smaller than the size of the observable universe, the Hubble redshift can be thought of as the Doppler shift corresponding to the recession velocity v {\displaystyle v} . For distances comparable to the size of the observable universe, the attribution of the cosmological redshift becomes more ambiguous, although its interpretation as a kinematic Doppler shift remains the most natural one. [92]The recession speeds associated with Hubble's law are not velocities in a relativistic sense (for example, they are not related to the spatial components of 4-velocities). Therefore, it is not remarkable that according to Hubble's law, galaxies farther than the Hubble distance recede faster than the speed of light. Such recession speeds do not correspond to faster-than-light travel. Kragh, Helge (2014). Masters of the Universe: Conversations with Cosmologists of the Past. Oxford University Press. p.210n30. ISBN 978-0-19-103442-8. The Big Bang explains the evolution of the universe from a starting density and temperature that is well beyond humanity's capability to replicate, so extrapolations to the most extreme conditions and earliest times are necessarily more speculative. Lemaître called this initial state the " primeval atom" while Gamow called the material " ylem". How the initial state of the universe originated is still an open question, but the Big Bang model does constrain some of its characteristics. For example, specific laws of nature most likely came to existence in a random way, but as inflation models show, some combinations of these are far more probable. [140] A flat universe implies a balance between gravitational potential energy and other energy forms, requiring no additional energy to be created. [133] [134] This graphic shows a timeline of the universe based on the Big Bang theory and inflation models. (Image credit: NASA / WMAP Science Team)

The Big Bang Theory: The Complete Series [DVD] [2007] [2020]

a b Diemand, Jürg; Zemp, Marcel; Moore, Ben; Stadel, Joachim; Carollo, C. Marcella (December 2005). "Cusps in cold dark matter haloes". Monthly Notices of the Royal Astronomical Society. 364 (2): 665–673. arXiv: astro-ph/0504215. Bibcode: 2005MNRAS.364..665D. doi: 10.1111/j.1365-2966.2005.09601.x. S2CID 117769706.As of December 5, 2009, all 23 episodes of Season 2 were also made available on Virgin Media TV Choice On Demand Service, but both seasons have now been removed.