Skywatch

  • June 21, 2007

    Episode 105: Globular Cluster Baby Booms

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    Shownotes

    Globular clusters are tightly packed groups of hundreds of thousands to millions of stars. Based on observations of their stars, it seems that the clusters formed when the universe was young, and that the stars within them formed simultaneously. New observations with the Hubble Space Telescope suggest at least one globular cluster has had several episodes of star formation, billions of years ago. All of the stars were born within 200 million years, very early in the life of the 12.5-billion-year-old cluster, but at distinct periods.