How do astronomers know the age of the planets and stars?

Measuring the ages of planets and stars is tricky. An observational astrophysicist describes the subtle clues that provide good estimates for how old different space objects are.

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How big is the universe?

Zahraničné zdroje - Novinky - Vesmír.sk

How do astronomers know the age of the planets and stars?

This Is How Astronomers Know The Age Of The Universe (And You Can

Astronomers measure enormous planet lurking far from its star