The Big Bang is indeed a scientific theory. It is the prevailing cosmological model explaining the origin of the universe. According to this theory, the universe began as an extremely hot and dense point approximately 13.8 billion years ago and has been expanding ever since.
The Big Bang theory is supported by a wide range of observational evidence, including the cosmic microwave background radiation, the abundance of light elements, and the large-scale structure of the universe. These observations provide strong support for the idea that the universe has evolved from a hot, dense state.
In scientific terms, a theory is a well-substantiated explanation of some aspect of the natural world that is based on a body of evidence and has been repeatedly tested and confirmed through observation and experimentation. The Big Bang theory fits this definition, as it is supported by extensive empirical evidence and has been refined over decades of research.
Therefore, the Big Bang is not just a hypothesis or a guess; it is a robust scientific theory that provides a comprehensive framework for understanding the origin and evolution of the universe.