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Grand old lady

We know that the universe is getting bigger at a certain rate by observing how fast distant galaxies are moving.

By working out how long it took everything to expand the where it is now, we can wind the clock back to the time when the universe was very, very small indeed.

This suggests that the universe is between 13 and 15 billion years old.

However, studies of globular clusters suggest some stars in our galaxy may be up to 18 billion years old.

Nivedidha S, IX A
Bangalore: The Oxford English School

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