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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 ...
Fresh corroboration of the perplexing observation that the universe is expanding more rapidly than expected has scientists pondering the cause - perhaps some unknown factor involving the ...
Thus, an accelerating universe took a longer time to expand from 2/3 to 1 times its present size, compared to a non-accelerating universe with constant ˙ and the same present-day value of the Hubble constant. This results in a larger light-travel time, larger distance and fainter supernovae, which corresponds to the actual observations.
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 will become extremely dark after the last stars burn out. Even so, there can still be occasional light in the universe. One of the ways the universe can be illuminated is if two carbon–oxygen white dwarfs with a combined mass of more than the Chandrasekhar limit of about 1.4 solar masses happen
Since the universe is expanding, the equation for that expansion can be "run backwards" to its starting point. The Lambda-CDM concordance model describes the expansion of the universe from a very uniform, hot, dense primordial state to its present state over a span of about 13.77 billion years [12] of cosmological time.
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.
After the observation of an accelerating universe, further modifications of the model were made. [14] The Planck particle is a hypothetical black hole whose Schwarzschild radius is approximately the same as its Compton wavelength; the evaporation of such a particle has been evoked as the source of light elements in an expanding steady-state ...