Soon after discovery, it was observed that quasars had a starlike appearance which was blurred by earth’s atmospheric "seeing." despite the blurring, it was realized that the intense energy emitting regions of quasars must be small because they
a. are very luminous. b. radiate huge amounts of energy. c. have high radial velocities. d. are surrounded by quasar fuzz. e. fluctuate rapidly on time scales as short as a few hours.

E. fluctuate rapidly on time scales as short as a few hours.

Explanation:

Quasars are defined as massive celestial object, emitting immense amounts of energy, and usually appearing as a star like image when viewed on a telescope. According to my research on Quasars, I can say that based on the information provided within the question they must be small because they fluctuate rapidly on time scales as short as a few hour.

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