Why were quasars so mysterious when first discovered?
A)Quasars emitted radio energy like radio galaxies, but looked like stars in visible light.
B)Quasars showed significant gravitational lens effects.
C)The spectra of quasars looked like those of M dwarfs.
D)The large redshifts originally indicated that they were orbiting the centre of the Milky Way.

Question

Quizplus · Accepted Answer

Quasars emitted radio energy like radio galaxies, but looked like stars in visible light, which was a mystery because radio galaxies were known to be far larger than stars.

Answer: D 
 The large redshifts originally indicated that quasars were orbiting the centre of the Milky Way, which was a mystery since they appeared to be extremely distant and would be too bright to be so close.

Why Were Quasars So Mysterious When First Discovered