According to the big bang theory, the entire universe began as a
a. supernova explosion.
b. cool, dark expansive nebula.
c. dense, hot, supermassive ball.
d. scattered band of space dust.



3 years ago Comment

The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it talks about the universe as we know it starting with a small singularity, then inflating over the next 13.8 billion years to the cosmos that we know today.
Therefore , the answer is b.