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(D) According to the pulsating theory of the universe,the universe undergoes cycles of expansion and contraction. The theory suggests that the univers

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$80$ billion years

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(D) According to the pulsating theory of the universe,the universe undergoes cycles of expansion and contraction. The theory suggests that the universe expands from a singularity (Big Bang),reaches a maximum size,and then contracts back to a singularity (Big Crunch). This cycle is estimated to repeat approximately every $80$ billion years. Therefore,the correct option is $D$.

According to the pulsating theory,the expansion and contraction of the universe repeats after every

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