D galaxy

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An extremely bright giant elliptical galaxy near the centre of a cluster of galaxies, in which it will be the first-ranked (i.e. brightest) member. They are assigned the letter D on Morgan's classification, which signifies that they are dustless. The more extreme supergiant examples at the centres of rich clusters are classified as cD galaxies. D galaxies are often radio sources, and are surrounded by extended envelopes of faint stars.

Subjects: Astronomy and Astrophysics.

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