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No astronomer is old enough to have actually *seen* a star evolve!
However,
when we plot a single stellar cluster, where all the stars have the same
age and distance, then we get a glimpse of how stars evolve.
Cluster at Birth. |
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Cluster after 8 Million years. After just 8 million years, the most massive stars are already running out of fuel! They begin to move away from the Main Sequence as they evolve into Red Supergiant Stars. |