Globular clusters are like astronomical coelacanths — mysterious living fossils. These densely packed collections of ancient stars may hold the ultimate secrets to the formation of galaxies.
. Those heavier elements are forged inside stars through nuclear fusion, and in a normal galaxy, continued rounds of star formation and star destruction continually enrich the galaxies. But because all of these globular clusters were born at roughly the same time, with no new star formation since then, the presence of metals means that the globular clusters had to form from an already-metal-rich environment.
Astronomers suspect that the young globular clusters formed with the Milky Way itself 8 billion to 10 billion years ago, while the older ones formed before our galaxy even got going. Those globular clusters probably formed with small, dwarf galaxies that got demolished by the Milky Way. The dwarf galaxies were torn apart, but the small, dense globular clusters managed to survive to the present day .Failed galaxies or superclusters?.
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