In a very young star cluster, while the most massive stars are swelling up into giants, the least massive stars are

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In a very young star cluster, the least massive stars evolve much more slowly due to their lower temperatures and pressures at their cores. Therefore, while the most massive stars are quickly evolving and swelling into giants, the least massive stars are still in the early stages of their life cycle, remaining on the zero-age main sequence where they are burning hydrogen into helium in a stable manner.

In a Very Young Star Cluster, While the Most Massive