The Big Bang Theory and the Steady State Theory

The Big Bang Theory

The Big Bang Theory proposes that the universe began from a single point of extremely high density and temperature around 13.8 billion years ago.
The initial “Big Bang” was not an explosion in space but an explosion of space. It is suggested that time and space began at this moment.
As the universe expanded and cooled, particles began to form. Eventually, these particles formed atoms, which then grouped together to form stars and galaxies.
The theory is supported by several pieces of evidence. Cosmic Microwave Background Radiation (CMBR), the even distribution of matter, and the redshift of distant galaxies all provide strong evidence for the Big Bang Theory.
The crucial aspect of the Big Bang Theory to remember is that it describes an expanding universe, starting from a single, extremely condensed point.
It also explains the composition of the universe, as the early formation of atoms would result in a universe dominated by hydrogen, helium, and small amounts of lithium - exactly what we observe today.

The Steady State Theory

An alternative theory to the Big Bang is the Steady State Theory, which proposes that the universe has always existed and is eternally unchanging on a large-scale basis.
The theory suggests that as the universe expands, new matter is continuously created in space to keep the universe’s density constant.
Unlike the Big Bang Theory, the Steady State Theory suggests an infinite universe, both in time (no beginning or end) and in space.
The theory had been a contender against the Big Bang Theory, but it doesn’t explain the observed redshift of distant galaxies as effectively.
A significant challenge to the Steady State Theory was the discovery of the Cosmic Microwave Background Radiation (CMBR), which is hard to explain under this theory but fits well with the Big Bang model.

Comparisons between the Big Bang Theory and the Steady State Theory are essential, particularly the challenge presented to these theories by redshift and CMBR observations. Understanding how each theory fits with these observations helps to validate why the Big Bang Theory is widely accepted.