Geology 1

Big Bang

According to the theory, the universe was once in a extremely hot and dense state that expanded rapidly.

According to recent measurements the universe is around 13.7 billion years old.

George Lemaitre

If the distance between galaxy clusters is increasing today, then everything must have been closer together in the past.

The Big Bang theory cannot and does not provide any explanation for such an initial condition; rather, it describes and explains the general evolution of the universe going forward from that point on.