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According to the theory of cosmic inflation initially introduced by Alan Guth and D. Kazanas, [23] if it is assumed that inflation began about 10 −37 seconds after the Big Bang and that the pre-inflation size of the universe was approximately equal to the speed of light times its age, that would suggest that at present the entire universe's ...
It represents the boundary between the observable and the unobservable regions of the universe, so its distance at the present epoch defines the size of the observable universe. Due to the expansion of the universe, it is not simply the age of the universe times the speed of light, as in the Hubble horizon, but rather the speed of light ...
Because humans cannot observe space beyond the edge of the observable universe, it is unknown whether the size of the universe in its totality is finite or infinite. [3] [56] [57] An estimate from 2011 suggests that if the cosmological principle holds, the whole universe must be more than 250 times larger than a Hubble sphere. [58]
Hence, it is unclear whether the observable universe matches the entire universe or is significantly smaller, though it is generally accepted that the universe is larger than the observable universe. The universe may be compact in some dimensions and not in others, similar to how a cuboid [citation needed] is longer in one dimension than the ...
Discovered through gamma-ray burst mapping. Largest-known regular formation in the observable universe. [8] Huge-LQG (2012–2013) 4,000,000,000 [9] [10] [11] Decoupling of 73 quasars. Largest-known large quasar group and the first structure found to exceed 3 billion light-years. "Giant Arc" (2021) 3,300,000,000 [12] Located 9.2 billion light ...
A twin universe could be exerting its gravity on ours, messing up our cosmic calculations. An Invisible Mirror World Might Be Making Our Universe Expand, Scientists Say Skip to main content
Approximate diameter (comoving distance) of the visible universe [1] 10 27: 1 Rm: 1.2 Rm Lower bound of the (possibly infinite) radius of the universe, if it is a 3-sphere, according to one estimate using the WMAP data at 95% confidence [52] It equivalently implies that there are at minimum 21 particle horizon-sized volumes in the universe.
As such, the observed size of the universe always increases. [ 1 ] [ 3 ] Since proper distance at a given time is just comoving distance times the scale factor [ 4 ] (with comoving distance normally defined to be equal to proper distance at the present time, so a ( t 0 ) = 1 {\displaystyle a(t_{0})=1} at present), the proper distance to the ...