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Swenson, Jim, Answer to a question about the expanding universe Archived 11 January 2009 at the Wayback Machine; Felder, Gary, "The Expanding universe". NASA's WMAP team offers an "Explanation of the universal expansion" at an elementary level. Hubble Tutorial from the University of Wisconsin Physics Department Archived 9 June 2014 at the ...
The accelerated expansion of the universe is thought to have begun since the universe entered its dark-energy-dominated era roughly 5 billion years ago. [ 8 ] [ notes 1 ] Within the framework of general relativity , an accelerated expansion can be accounted for by a positive value of the cosmological constant Λ , equivalent to the presence of ...
"Yes, it appears there is something missing in our understanding of the universe," added Riess, a 2011 Nobel laureate in physics for the co-discovery of the universe's accelerating expansion. "Our ...
The Friedmann equations showed the universe might be expanding, and presented the expansion speed if that were the case. [5] Before Hubble, astronomer Carl Wilhelm Wirtz had, in 1922 [ 6 ] and 1924, [ 7 ] deduced with his own data that galaxies that appeared smaller and dimmer had larger redshifts and thus that more distant galaxies recede ...
It may be that we have misunderstood the universe and its physics, or it may be that the measurements have been inaccurate. Now, however, researchers have used the James Webb Space Telescope along ...
The universe is expanding faster than previously believed, a surprising discovery that could test part of Albert Einstein's theory of relativity.
According to Hubble's law, the expansion of the universe causes distant galaxies to appear to recede from us faster than the speed of light. However, the recession speed associated with Hubble's law, defined as the rate of increase in proper distance per interval of cosmological time, is not a velocity in a
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.