Suppose In astrophysics, the "Big Bang Theory" is the prevailing cosmological model for the observable universe from the earliest known periods through its subsequent large-scale evolution. The model describes how the universe expanded from a very high-density and high-temperature state, and offers a comprehensive explanation for a broad range of phenomena, including the abundance of light elements, the cosmic microwave background (CMB) radiation, and large scale structure.
Can we infer that "The Big Bang Theory is the only theory in astrophysics"? Yes, no, or maybe?