The discovery of quasars supported the big bang theory and went against the steady state theory.
Big bang theory timeline.
According to the steady state theory these quasars should be found all throughout the galaxy but they are only found on the outskirts which supports the big bang theory in which the universe is constantly expanding.
Since the big bang 13 7 billion years ago the universe has passed through many different phases or epochs.
Models that aim to describe the universe and physics during the planck epoch are generally speculative and fall under the umbrella of new physics.
In this theory the big bang is just the latest big bang in an endless stream of big bangs in the continual expansion collapse and renewed expansion of space and time.
Working backwards from the current state of the universe scientists have theorized that it must have originated at a single point of infinite density and finite.
Timeline of the big bang theory.
The big bang theory is a cosmological model of the observable universe from the earliest known periods through its subsequent large scale evolution.