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Corona Borealis


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A small but distinctive constellation of the northern sky, popularly known as the Northern Crown. It features a prominent arc of stars, the brightest of which is Alpha Coronae Borealis (Alphecca or Gemma). It contains two remarkable variables: R Coronae Borealis, the prototype of a group that undergoes sudden dips in light output (see R Coronae Borealis star); and T Coronae Borealis, a recurrent nova known as the Blaze Star.

Subjects: Astronomy and Astrophysics.


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