Why is the Big Bang a theory and not a fact?

We need to make assumptions in order to reach substantial conclusions. So we often act as if something like Big Bang theory is a fact, but we cannot know it to be so. Essentially in any natural science we cannot prove anything to be true.

What is the evidence behind the Big Bang?

What evidence is there to support the Big Bang theory? Two major scientific discoveries provide strong support for the Big Bang theory: • Hubble’s discovery in the 1920s of a relationship between a galaxy’s distance from Earth and its speed; and • the discovery in the 1960s of cosmic microwave background radiation.

Was the Big Bang truly the beginning of the universe?

The Big Bang can no longer be described as the very beginning of the Universe that we know, and the hot Big Bang almost certainly doesn’t equate to the birth of space and time. So, if the Big Bang wasn’t truly the beginning, what was it? Here’s what the science tells us.

What happens when the Big Bang comes to an end?

And finally, when this phase of the Universe — this period of inflation — came to an end, that energy would get converted into matter-and-radiation, creating the hot, dense state synonymous with the Big Bang.

How long has the CMB radiation been cooling?

The CMB radiation has been cooling for over 13.7 billion years and will continue to cool. One of the biggest successes of the Big Bang Theory was its prediction of the CMB spectrum with its almost perfect match to precisely measured data. Top The COBE satellite did a lot more than just confirm the CMB spectrum.

What was the original Big Bang radiation?

The original Big Bang radiation was very strong Gamma Rays with extremely high temperatures and frequencies. The current CMB radiation has been traveling incredible lengths, has cooled almost to zero, and has red shifted from very high frequencies to relatively low frequencies.