To date, physicists have investigated the behavior of matter and energy at temperatures as high as those that existed in the universe as far back as ________ after the Big Bang.
Answer
A. 1 million years
B. 300,000 years
C. 300 years
D. 3 minutes
A. 1 million years
B. 300,000 years
C. 300 years
D. 3 minutes
E. 
10-10 second
10-10 second