Is the big bang theory true?

Cosmic back ground micro wave radiation. Red shift of Galaxies,.These are the two main evidence available to justify the Big Bang.

The Big Bang Theory is just that - a Theory. If it was unequivocally true, it would not be identified as a theory.

As the other answer states, it is believed to be the best scientific explanation of how the universe came to be, but again, it is not unequivocally true.

It is also, without a doubt, insufficient because it only states that there was a significant explosion without elaborating on the origin of the matter.

But to say that it is only a theory would be inaccurate, since a theory is not dependent on evidence. By the same logic, gravity is also merely a theory.

Gravity and the Big Bang are examples of scientific theories, and in order to be considered scientific, they must follow the Scientific Method.

The most widely accepted cosmological model for the observable universe is the Big Bang theory, which suggests that the universe expanded from a hot, dense state about 13.8 billion years ago. It is backed by a number of lines of evidence, such as the cosmic microwave background radiation, the observed redshift of galaxies, and the abundance of light elements. Although scientists are still working to improve and explore some aspects of the theory, the Big Bang theory as a whole is generally acknowledged in the scientific community as the most plausible explanation for the universe's origin and evolution.