Question

how age of universe was discovered
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Answer 1

Answer:

Astronomers estimate the age of universe in two ways:

1. by looking for the oldest star; and
2. by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.

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Answer 2

Explanation:

Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.