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Generations of Giants
Within a globular cluster orbiting the center of our galaxy, @NASAHubble found two separate populations of red giant stars, one unusually helium rich. These observations challenge ideas about formation. Did they arise together? https://go.nasa.gov/3mk1Ekc
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Hubble Spies a Multi-Generational Cluster

This image from the NASA/ESA Hubble Space Telescope shows the globular star cluster NGC 2419.
Andrea Gianopoulos (NASA)
#NASAExoplanets
in reply to NASA

John Shirley
John Shirley
• •
it make sense if they started out more or less at the same time and they are of the order of star that would become a red giant (like our own), they would age into red giant about the same rate. Most interesting. Lovely too.

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