The Big Bang theory does provide an explanation for the questions When did the universe form? and What is the temperature of deep space?
The Big Bang theory does not answer the question How did galaxies and stars form? and What is the future of the universe?.
While it explains the initial conditions and expansion of the universe, the formation of galaxies and stars and the ultimate fate of the universe require additional theories and models, such as cosmic inflation and dark energy, for a more comprehensive understanding.