The Big Bang Theory: From Hypothesis to Evidence

The Big Bang theory proposes the universe began about 13.8 billion years ago.
Belgian priest Georges Lemaître first suggested the idea of a “primeval atom” in the 1920s.
Edwin Hubble’s discovery of an expanding universe supported the concept.
In 1965, Penzias and Wilson detected the Cosmic Microwave Background (CMB), strong evidence for the Big Bang.
The CMB is the faint afterglow of the universe’s fiery birth.
Big Bang nucleosynthesis explains the abundance of hydrogen and helium.
The theory replaced the Steady State model, which claimed the universe was eternal.
The discovery of cosmic expansion and CMB confirmed a dynamic, evolving universe.
Modern satellites like WMAP and Planck mapped the CMB with great precision.
The Big Bang remains the leading explanation for the origin and evolution of the cosmos.