El anterior post sobre la estrella fósil nos ha llevado a repasar el concepto de ‘universo’. Es, sencillamente, ¿’todo’?. Un repaso de conceptos rápido en la wikipedia:

– Different words have been used throughout history to denote “all of space”, including the equivalents and variants in various languages of “heavens”, “cosmos“, and “world”.

defined as the summation of all particles and energy that exist and the space-time in which all events occur-

The currently accepted scientific theory of the universe’s formation is the Big Bang model, which describes the expansion of space-time from a gravitational singularity.
By extrapolating this expansion back in time, one approaches a gravitational singularity where everything in the universe was compressed into an infinitesimal point; an abstract mathematical concept that may or may not correspond to reality. This idea gave rise to the Big Bang theory, the dominant model in cosmology today.

– A majority of cosmologists believe that the observable universe is an extremely tiny part of the “whole” (theoretical) Universe and that it is impossible to observe the whole of comoving space

– Currently the evidence suggests not only that there is insufficient mass/energy to cause a recollapse, but that the expansion of the universe seems to be accelerating and will accelerate for eternity

– The currently observable universe appears to have a geometrically flat space-time containing the equivalent mass-energy density of 9.9 × 10-30 grams per cubic centimetre. The primary constituents appear to consist of 73% dark energy, 23% cold dark matter and 4% atoms.

Very little is known about the size of the universe. It may be trillions of light years across, or even infinite in size.


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