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The brightest star in Scorpius is Antares, a vivid-red, first-magnitude star that is among the largest supergiants known. Antares, a visual double star, is accompanied by a much smaller green companion. The constellation contains numerous multiple-star systems, nebulas, and globular clusters as well as a particularly black, dusty region called the Coal Sack.
The strongest X-ray source yet known in the sky, Sco X-1, was discovered in Scorpius and identified as a peculiar blue variable star.