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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]
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 ...
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 ...
A variable yellow hypergiant whose size varied from around 680 R ☉ in 1950–1970 to 910 R ☉ in 1977, and later decreased to 390 R ☉ in the 1990s. [80] V382 Carinae (x Carinae) 485 ± 56 [81] L/T eff: A yellow hypergiant, one of the rarest types of stars. V838 Monocerotis: 464 [82] L/T eff
But unlike the jet formed by J1601+3102, Porphyrion was found 7.5 billion light-years away from Earth in what’s called the “nearby” universe, rather than the early universe, according to the ...
The universal wavefunction or the wavefunction of the universe is the wavefunction or quantum state of the entire universe. [1] ... systems of macroscopic size, we ...
Physical cosmology was shaped through both mathematics and observation in an analysis of the whole universe. The universe is generally understood to have begun with the Big Bang, followed almost instantaneously by cosmic inflation, an expansion of space from which the universe is thought to have emerged 13.799 ± 0.021 billion years ago. [8]
Size and shape of the universe: The diameter of the observable universe is approximately 93 billion light-years; what is the size of the whole universe? Is it infinite? What is the 3-manifold of comoving space, i.e. of a comoving spatial section of the universe, informally called the "shape" of the universe?