Approximately how old is the universe according to the Big Bang theory as stated in the NCERT chapter on Evolution?
A{'text': 'About 4.5 billion years (the age of earth itself)', 'label': 'A'}
B{'text': 'About 13.8 billion years (a single huge initial explosion)', 'label': 'B'}
C{'text': 'About 3 billion years (the age of early macromolecules)', 'label': 'C'}
D{'text': 'About 65 million years (since the dinosaur extinction)', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'About 13.8 billion years (a single huge initial explosion)', 'label': 'B'}
The chapter states the universe is almost 13.8 billion years old. The Big Bang involved a singular huge explosion, after which the universe expanded and cooled, allowing hydrogen and helium to form and condense into galaxies.
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