Main-sequence star activity refers to the various dynamic phenomena and processes that occur in stars during the main sequence phase of their evolution, where they spend the majority of their lifetimes fusing hydrogen into helium in their cores. This activity includes fluctuations in brightness, surface temperature changes, and magnetic phenomena such as solar flares and sunspots. Understanding this activity is essential as it influences stellar behavior, energy output, and even the habitability of surrounding exoplanets.
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