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Featured on October 3, 2021

This Hubble Space Telescope image shows Messier 15, an ancient star cluster in Pegasus. It contains some of the oldest stars in the galaxy. Some of its stars are nearing the ends of their lives so they're puffing up and getting cooler, shining dull orange. One star has already passed this stage of life, sloughing off its outer layers to form a planetary nebula (blue blob to the lower left of center). [ESA-Hubble/NASA]

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Find out more in our radio program entitled

Messier 15

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Two stars trying to get in sync

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