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Seyfert galaxies are a distinct class of galaxies becauseA)they are very close to the Milky Way and ...

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Seyfert galaxies are a distinct class of galaxies becauseA)they are very close to the Milky Way and ...

Seyfert galaxies are a distinct class of galaxies because
A)   they are very close to the Milky Way and appear to be gravitationally bound to it.
B)   they have very bright, very hot starlike central cores with variable energy output.
C)   they are completely devoid of structure, appearing to be amorphous spheres of gas and dust.
D)   they are in the constellation of Seyfert in the southern hemisphere sky.

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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