Seyfert Galaxies Were Once Considered to Be a Distinct Class

Seyfert galaxies were once considered to be a distinct class of galaxies because they:

A) are completely devoid of structure, appearing to be amorphous spheres of gas and dust.
B) are in the constellation of Seyfert in the southern hemisphere sky.
C) are very close to the Milky Way and appear to be gravitationally bound to it.
D) have hot and very bright and variable, compact central cores.

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