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Beyond the fact that the cosmic microwave background (CMB) is a direct prediction of the big bang model, there is the question of how you would produce it in any other way. It is remarkably close to being isotropic and remarkably close to being a blackbody spectrum - i.e. it is almost a perfect blackbody radiation field. A blackbody radiation field is ...


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The Big Bang model of an expanding Friedmann universe, with a hot and dense early era that cooled and thinned as the universe expanded, predicted the existence, isotropy, and approximate temperature of the cosmic microwave background. So the discovery of this CMB is considered strong confirmatory evidence for that remarkably simple and elegant model. See ...


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Nope. I think u are mistaken the age of the Universe with the particle horizon which settles the limit of the observable Universe. The $\Lambda$CDM model gives us a value of $d=45 \text{ }\mathrm{by}$. With time, as the Universe expansion is faster than light for certain distince (Hubble radius), the observable Universe will change, galaxies which are in ...


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GR predicts accelerated expansion of spacetime should create gravitational wave, how? How are gravitational waves generated? Gravitational waves are disturbances in the curvature of spacetime, generated by accelerated masses, that propagate as waves outward from their source at the speed of light. .... Gravitational waves transport energy as ...


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