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автор  дата 09.01.2019
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The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. The model accounts for the fact that the universe expanded from a very high density and high temperature state, and offers a comprehensive explanation faor a broad range of phenomena, including the abundance of light elements, the cosmic microwave background, large scale structure and Hubble's Law.If the known laws of physics are extrapolated to the highest density regime, the result is a singularity which is typically associated with the Big Bang. Detailed measurements of the expansion rate of the universe place this moment at approximately 13.8 billion years ago, which is thus considered the age of the universe. After the initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms. Giant clouds of these primordial elements later coalesced through gravity in halos of dark matter, eventually forming the stars and galaxies visible today. Timeline of the metric expansion of space, where space (including hypothetical non-observable portions of the universe) is represented at each time by the circular sections. On the left the dramatic expansion occurs in the inflationary epoch, and at the center the expansion accelerates (artist's concept; not to scale). Since Georges Lemaître first noted in 1927 that an expanding universe could be traced back in time to an originating single point, scientists have built on his idea of cosmic expansion. While the scientific community was once divided between supporters of two different expanding universe theories, the Big Bang and the Steady State theory, empirical evidence provides strong support for the former.[8] In 1929, from analysis of galactic redshifts, Edwin Hubble concluded that galaxies are drifting apart; this is important observational evidence consistent with the hypothesis of an expanding universe. In 1965 the cosmic microwave background radiation was discovered, which was crucial evidence in favor of the Big Bang model,[9] since that theory predicted the existence of background radiation throughout the universe before it was discovered. More recently, measurements of the redshifts of supernovae indicate that the expansion of the universe is accelerating, an observation attributed to dark energy's existence.[10] The known physical laws of nature can be used to calculate the characteristics of the universe in detail back in time to an initial state of extreme density and temperature.[11] The Big Bang theory developed from observations of the structure of the universe and from theoretical considerations. In 1912 Vesto Slipher measured the first Doppler shift of a "spiral nebula" (spiral nebula is the obsolete term for spiral galaxies), and soon discovered that almost all such nebulae were receding from Earth. He did not grasp the cosmological implications of this fact, and indeed at the time it was highly controversial whether or not these nebulae were "island universes" outside our Milky Way.[37][38] Ten years later, Alexander Friedmann, a Russian cosmologist and mathematician, derived the Friedmann equations from Albert Einstein's equations of general relativity, showing that the universe might be expanding in contrast to the static universe model advocated by Einstein at that time.[39] In 1924 Edwin Hubble's measurement of the great distance to the nearest spiral nebulae showed that these systems were indeed other galaxies. Independently deriving Friedmann's equations in 1927, Georges Lemaître, a Belgian physicist and Roman Catholic priest, proposed that the inferred recession of the nebulae was due to the expansion of the universe.[40] In 1931 Lemaître went further and suggested that the evident expansion of the universe, if projected back in time, meant that the further in the past the smaller the universe was, until at some finite time in the past all the mass of the universe was concentrated into a single point, a "primeval atom" where and when the fabric of time and space came into existence.[41] Starting in 1924, Hubble painstakingly developed a series of distance indicators, the forerunner of the cosmic distance ladder, using the 100-inch (2.5 m) Hooker telescope at Mount Wilson Observatory. #Universe #Space #Documentary
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автор  дата 27.12.2018
Presenting official trailer of The Accidental Prime Minister. In cinemas, January 11th 2019. A film based on the book "The Accidental Prime Minister" by Mr.
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автор  дата 15.01.2019
The Bachelor Colton talks about his virginity, who he chooses in the end, what the fantasy suite week was like, and leaving the show halfway through shooting ...
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автор  дата 15.04.2011
Moonshine Jungle Tour 2014 tickets and more info: http://www.brunomars.com/moonshinejungletour Available now on iTunes! http://smarturl.it/Doo-Wops ...
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автор  дата 23.03.2009
Song by Bryant Oden. Video by Forrest Whaley. iOS app out now! Works on iPod Touch, iPad, & iPhone...
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автор  дата 16.12.2016
TROLLS (Original Motion Picture Soundtrack) out now! iTunes: http://smarturl.it/Trolls?IQid=dwyt Spotify: http://smarturl.it/StreamTrollsOST?IQid=dwyt Amazon: ...
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автор  дата 08.03.2018
"Camila" album available at: Spotify http://smarturl.it/Camila_Sptfy Apple Music http://smarturl.it/Camila_AM iTunes http://smarturl.it/Camila_iTunes Google Play ...
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автор  дата 10.01.2019
Planets that orbit two suns instead of one might be deadly hell worlds, but new discoveries reveal that sci-fi star systems with binary stars might be optimal ...
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Seth takes a closer look at how it's becoming clear that President Trump has no way out of the government shutdown he's boxed himself into. » Subscribe to Late ...
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автор  дата 17.01.2019
Stephen A. Smith says that an unnamed source told him that it would be easier for Boston Celtics star Kyrie Irving to join the Los Angeles Lakers after ...
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автор  дата 16.01.2019
Everyone gets burnout, even YouTubers. The Try Guys decide to take a break for their mental health and learn all about the importance of achieving a more ...
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автор  дата 27.10.2017
The official audio of "The Greatest Show" by The Greatest Showman Cast from 'The Greatest Showman Soundtrack'. 'The Greatest Showman Soundtrack' ...
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автор  дата 16.01.2019
Rat-A-Tat |'LIVE Shopping In The Supermarket Full Episoades'| Chotoonz Kids Funny Cartoon Videos #shoppingcartoons #livecartoons #youtubelive ⏩⏩⏩ To ...
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автор  дата 17.01.2019
Kate Hudson and her mom Goldie Hawn proved just how close they are as they recalled Kate's recent birthing experience, in which Goldie got a little too close to ...
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автор  дата 16.01.2019
Subscribe to my second channel here : https://www.youtube.com/channel/UCGlzHKdCMDQ9y359S4RcNoQ No copyright infringement intended. All rights go to ...
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автор  дата 08.03.2018
The Grinch - Official Trailer In Theaters November 9 https://www.grinchmovie.com For their eighth fully animated feature, Illumination and Universal Pictures ...
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Ronny Chieng highlights some of the most ridiculous junk on display at this year's CES, including a vending machine for bread and a needy AI robot called a ...
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автор  дата 24.05.2018
Bounce along in the bus all over town with this favorite nursery rhyme! https://www.youtube.com/c/Cocomelon?sub_confirmation=1 WEBSITE: http://www.
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автор  дата 14.01.2019
Music video by The Killers performing Land Of The Free. © 2019 Island Records, a division of UMG Recordings, Inc. http://vevo.ly/vXcrmB.
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автор  дата 19.01.2019
Spektrum: Use Offer Code WANSHOW10 to save 10% off the Lumin Driving Glasses on Amazon at https://lmg.gg/lumin Humble Bundle: Check Out Humble ...
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