Which star cluster is the oldest known globular cluster candidate?
Quick Answer
Globular clusters like NGC 6397 are among the oldest stellar systems in the Milky Way, with ages around 13 billion years. They formed early in the galaxy’s history.
The Full Story
NGC 6397 is one of the best-studied ancient globular clusters in the Milky Way. Its age is estimated at about 13 billion years, making it nearly as old as the universe itself. Globular clusters are dense, spherical collections of very old stars bound by gravity. Because they formed early, they are valuable clues to the Milky Way’s earliest development. Their stars are typically low in heavy elements, reflecting the chemical conditions of the young universe.
Key Facts
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