🔄FROM THE ARCHIVE No better time than the present to reconsider the well-held theory.
The Big Bang is the defining narrative of modern cosmology: a bold declaration that our universe had a beginning and has a finite age, just like the humans who live within it. That finite age, in turn, is defined by the evidence that universe is expanding . Those two ideas — a singular cosmic beginning, followed by billions of years of cosmic growth — are so strange that some people have never made peace with them.
In popular conversation, the Big Bang is often used broadly to mean the mysterious primal event that created the universe, and it is commonly envisioned as a tremendous explosion emanating from a single point. But that is not what cosmologists mean by the Big Bang.. “This is a hard concept for people to get their heads around,” says, a veteran cosmologist at the University of Chicago.
The expanding universe stretches light, causing it to appear increasingly red with distance. There is no other known explanation for this cosmological redshift. the Big Bang is a model describing how the universe expanded from an extremely hot, dense early state into the reality that we see today The most famous evidence for the Big Bang comes from “redshifts,” the observed stretching of light from distant galaxies, but that’s hardly the only source of support. The spectrum and distribution of the cosmic microwave background exactly matches expectations of the hot Big Bang. The evolution of galaxies testifies to the finite age of the universe, and the observed ages of stars exactly match up with the age of the universe deduced from the cosmic expansion.
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