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. The age of the universe (that is, the time since the Big Bang) is 14...

. The age of the universe (that is, the time since the Big Bang) is 14 billion years. The age of the Solar System is 4.56 billion years. Thus, the Solar System has existed for 32.6% of the age of the universe. For what percentage of the total age of the universe have existed: (i) helium nuclei, (ii) neutral atoms, (iii) galaxies, and (iv) the U.S.

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