What is a quasar?
A) a star-like object that actually represents a bright patch of gas in the Milky Way
B) a very large galaxy thought to be formed by the merger of several smaller galaxies, resulting in a quick burst of star formation
C) The name given to the largest objects in the Kuiper Belt
D) the extremely bright center of a distant galaxy, thought to be powered by a supermassive black hole
E) another name for very bright stars of spectral type O
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