Astronomers have been perplexed by the presence of stars scattered throughout giant clusters of hundreds or thousands of galaxies, emitting a faint glow of light. These stars are not gravitationally bound to any one galaxy in the cluster, leading to the question of how they got there. Possible explanations include the stars being stripped from the galaxies, being thrown around after galaxy mergers, or being present since the cluster’s formation billions of years ago.
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