How Do Star Clusters Help Astronomers Measure Stellar Ages?

How can stars born together act as a controlled experiment in mass and evolution?

Read a cluster's turnoff point while checking shared age, composition, distance, and membership assumptions.

A realistic open star cluster containing hot blue stars, many white and yellow stars, and several orange evolved stars in one shared stellar family. — Vastward scientific artistic reconstruction. Colour and brightness diversity motivates the H-R-diagram comparison; this is not a calibrated observation of one named cluster.

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