Answer;
Big bang theory
The discovery of cosmic microwave background radiation and primordial helium gas was scientific evidence supporting the big band theory.
Explanation;
- The Cosmic microwave background radiation was a faint background radiation which was a remnant from an early stage of the universe during the Big Bang.
- Cosmic microwave background radiation is an important source of data on early universe since it is the oldest radiation in the universe. This radiation was a remnant from the origin or birth of the universe, and provided strong evidence that the universe expanded from an initial violent explosion known as the Big Bang.
