What Is a Quasar

What is a quasar?

A) a starlike 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,typically found in the center of a galaxy cluster
C) a specialized astronomical instrument for observing distant stars
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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