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.

Astronomers Watch as Planets Are Born

Astronomy – News, Research and Analysis – The Conversation – page 2

Astronomers discovered that the shadow of the M87* black hole wobbles

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

How do astronomers know the age of the planets and stars

Planetary Motion: The History of an Idea That Launched the

Are We Alone? - How astronomers hope to find life in the Universe

In a first, astronomers spot the aftermath of an exoplanet smashup

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