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Q: How old is our universe?
  • A. 13.6 billion years
  • B. 4.6 billion years
  • C. 5.8 billion years
  • D. 8.9 billion years
Correct Answer: Option A - Our universe is about 13.8 billion years old. Astronomers estimate the age of the universe in two ways: (a) by looking for the oldest stars; and (b) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang.
A. Our universe is about 13.8 billion years old. Astronomers estimate the age of the universe in two ways: (a) by looking for the oldest stars; and (b) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang.

Explanations:

Our universe is about 13.8 billion years old. Astronomers estimate the age of the universe in two ways: (a) by looking for the oldest stars; and (b) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang.