The universe started ……… ago.
The universe started ……… ago.
(A) 18.7 billion years
(B) 13.7 billion years
(C) 16.7 billion years
(D) 15.7 billion years
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The universe started ……… ago.
(A) 18.7 billion years
(B) 13.7 billion years
(C) 16.7 billion years
(D) 15.7 billion years