Why is it the prevailing cosmological model? 🤔
The Big Bang Theory is the most accepted cosmological model explaining the origin and evolution of the universe. The theory says that all the energy and spacetime in the universe were initially contained in an infinitely dense, hot, and incredibly tiny singularity. A massive expansion is believed to have started out from that super hot and super dense speck about 13.8 billion years ago.
The Big Bang Theory is supported by this law, which states that galaxies are drifting apart at a rate that increases as the distance between them increases . Astronomers know this due to a noticeable shift in the light that galaxies emit toward the end of the visible spectrum —a phenomenon called"galactic redshift."
Temperature variations in the cosmic background radiation measured with the satellite COBE. Source: Large Norwegian Encyclopedia
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