Since the JWST has been brought up in this thread with its implications on cosmology, an example of a prediction of the Big Bang is the existence of a relic background radiation known as the CMB (Cosmic Microwave Background) and its temperature today Tₒ.To use an analogy science is like detective work where it is very rare to have an eyewitness or first hand account. When theories such as Evolution or the Big Bang make a string of predictions that are verified by experiment and observation it strengthens the premise about these unobservable events.
Here is a timeline of the prediction of the CMB first made in 1946 and its accidental discovery in 1964.
Paradoxically the CMB is opaque in the electromagnetic spectrum making it impossible for telescopes to probe back to the time of the Big Bang yet its very existence is overwhelming evidence the Big Bang did occur.
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