Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. The Pleiades star cluster is one of the jewels of the northern sky . To the unaided eye it appears as a lovely and tantalizing grouping of stars in the constellation of Taurus , while telescopic views reveal cluster stars surrounded by delicate blue wisps of dust-reflected starlight . The Pleiades stars seen in X-rays have extremely hot, tenuous outer atmospheres called coronas and the range of colors corresponds to different coronal temperatures .
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