Many scientists accept a theory about the origin of the universe, called the big bang theory. describe at least one piece of scientific evidence that is used to support this theory of the origin of the universe.
Red shift is one piece of observational evidence which supports the big
bang theory. The fact that galaxies are moving away from us means that
the universe was once much smaller, supporting the big bang theory which
states that all the matter in the universe once occupied a single point
with infinite density.
