. One scientific theory of the origin of the universe is the much misunderstood big bang theory
A.
. Physicists now believe they can construct what happened in the universe during the first three minutes of its beginning
B.
Many scientists believe that, during microwave experiments, we can actually “hear” echoes of the big bang.
C.
The popular notion is that the big bang was a huge explosion in space, but this is far too simple a description
D.
. The big bang theory, if accepted, convinces us that the universe was not always as it is now