What is the major observational difference between a Seyfert galaxy and a normal spiral galaxy
A)Normal spiral galaxies usually have shorter spiral arms.
B)Normal spiral galaxies never contain a supermassive black hole at their center.
C)The central region of a Seyfert galaxy is much brighter.
D)Seyfert galaxies don't contain any star formation.

Question

Quizplus · Accepted Answer

The major observational difference between a Seyfert galaxy and a normal spiral galaxy is that the central region of a Seyfert galaxy is much brighter. Seyfert galaxies have an extremely bright and active galactic nucleus, powered by a supermassive black hole surrounded by an accretion disk. This leads to emission of bright and high-energy radiation, making the central region of the galaxy much brighter compared to a normal spiral galaxy which has a relatively inactive center.

What Is the Major Observational Difference Between a Seyfert Galaxy