The concept of the block universe, also known as four-dimensionalism, suggests that the past, present, and future all exist simultaneously as a static block of spacetime. According to this view, everything that has ever happened or will happen is already determined and fixed. However, it's important to note that the block universe is just one of the philosophical interpretations of time, and it's not universally accepted by all physicists or philosophers.
If we assume the block universe is real, it implies that the entire history of the universe, including the expansion and evolution of galaxies, stars, and life, is already embedded in the fabric of spacetime. From this perspective, there is no real notion of things "changing" or "evolving" in the traditional sense because all events and states already exist in a timeless manner.
In this view, the Big Bang event is not seen as a point of origin or expansion but rather a moment within the static structure of the block universe. The expansion of the universe, as described by the theory of cosmic inflation and the subsequent evolution of galaxies, stars, and life, would already be contained within the block universe.
It's important to note, however, that the nature of time and the true nature of the universe are still topics of ongoing scientific research and philosophical debate. Different interpretations and models exist, and our understanding may continue to evolve as new evidence and theories emerge.