A temporary cool, dark region on a star's surface caused by intense magnetic fields that inhibit convection and reduce local temperature. These features are the stellar equivalent of sunspots and indicate magnetic activity in the star's atmosphere.
Compound word from 'star' and 'spot,' directly analogous to 'sunspot.' The term emerged as astronomers discovered that other stars exhibit similar magnetic phenomena to those observed on the Sun, extending solar physics to stellar astrophysics.
Starspots can be absolutely gigantic compared to sunspots—some cover areas larger than our entire solar system! These magnetic monsters reveal that other stars can be far more magnetically violent than our relatively calm Sun, with some young stars covered by spots so extensive they make the star appear significantly dimmer and redder than it would otherwise.
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