What evidence supports The Big Bang theory?

Big Bang theory

The Big Bang Theory is the most widely prevailing theory for how the universe began. Furthermore, it states that it began with a small singularity and grew over 13.8 billion years to become the cosmos we see today.

The phrase “Big Bang Theory” has been common among astrophysicists for years. But it became popular in the common person in 2007 when CBS aired a tv show of the same name. The show ended in 2019 after following the home and academic lives of several researchers, including physicists, an astrophysicist, and an engineer.


According to NASA, the surrounding temperature was about 10 billion degrees Fahrenheit. This temperature was in the first second after the universe began. The universe was full of fundamental particles like neutrons, electrons, and protons. As the universe cooled, these decayed or combined.

Because light couldn’t pass through it. According to NASA, due to free movement of electrons would have caused light (photons) to spread out. It was in the same way that sunlight scatters from water droplets in clouds.” However, over time, the free electrons collided with nuclei, forming neutral atoms. Furthermore, about 380,000 years after the Big Bang, this allowed light to shine through.

We also know cosmic microwave background as light. It is sometimes they refer to as the “afterglow” of the Big Bang (CMB). Ralph Alpher and other scientists predicted it in 1948, but it was discovered almost 20 years later by chance.

Evidence for the Big Bang

The Big Bang theory, like all science, is based on evidence. So, what is the evidence for it?

Redshift of Galaxies

The Universe is most likely expanding. Because it is evident from the redshift of distant galaxies. If we go back far enough in time everything must have been crushed together into a tiny dot. The Big Bang was the result of a rapid explosion from this tiny dot.

Microwave Background

The entire Universe was extremely hot at one point in its history. This heat left behind a “glow” that pervades the entire Universe as it expanded. The Big Bang theory predicts that this glow will not only exist but will also be visible as microwaves, which are a part of the Electromagnetic Spectrum.

Mixture of Elements

Some of the elements today, created as the Universe expanded and cooled. Furthermore, The Big Bang theory predicts how much of each element produced in the early universe. Therefore, what we see in far-off galaxies and old stars matches this prediction perfectly.

Looking back through the years

The Steady State theory is the most popular alternative to the Big Bang theory of the Universe. According to this theory, the Universe does not change significantly over time.Remember that because light takes a long time to travel across the Universe, we are looking back in time when we look at distant galaxies.


As a result, we can see that galaxies from long ago differed significantly from those seen today, indicating that the Universe has evolved. The Big Bang theory fits comparatively, better than the Steady State theory.

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