flare star

Noun
  1. A red dwarf star in which luminosity can change several magnitudes in a few minutes (synset 109304158)
    is a type of: red dwarf, red dwarf star - a small, old, relatively cool star; approximately 100 times the mass of Jupiter
    specific instances: proxima, proxima centauri - the nearest star to the sun; distance: 4.3 light years

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