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6. Which one of the following theories is now generally considered to be a satisfactory theory about the origin of the universe
A. The oscillating universe theory
B. the steady state theory
C. The pulsating theory
D. The big bang theory
Explanation:
7. According to pulsating theory, the expansion and contraction repeat after
A. 80 billion years
B. 8 billion years
C. 8 million years
D. 80 million years
Explanation:
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