How did the age of the universe become known?

Returning to the very distant past

If we mentally turn the expansion of the universe backwards, it proves that distances between all of the observed objects were zero about 14 billion years ago. The study of developing of some very-very slow processes, such as the radioactive decay of elements in the Earth’s crust and in meteorites, or the evolution of stars, gives approximately the same value for the minimum age of the universe. For example, we know at which rate the white dwarfs are growing dim, thus it is possible to determine the age of the oldest representatives of such stars in our galaxy.

Stages of expansion of the universe and history

For a long time there were no stars, so it was dark.

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