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Star that varies in brightness repeatedly but sporadically, sometimes by more than one magnitude, within a few minutes. The cause is thought to be the eruption of flares like those observed on the Sun but much larger (seesolar flare). Proxima Centauri, in Alpha Centauri, the closest star to the Sun, is a flare star.
This entry comes from Encyclopædia Britannica Concise. For the full entry on flare star, visit Britannica.com.
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