Debates about the nature of so-called "spiral nebulae" were ongoing until about 20 years ago.
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Q6: Rapid fluctuations in the brightness of active
Q7: Large galaxies in a rich cluster may
Q8: No known galaxy has its spectra lines
Q9: The Tully-Fisher relation is mainly used for
Q10: The acronym AGN stands for active galactic
Q12: Gravitational lensing involves using a special type
Q13: Lenticular galaxies are intermediate between spiral and
Q14: Observations indicate that galaxies arose from the
Q15: Starburst galaxies occur when a rapid and
Q16: A barred spiral galaxy has young,hot,blue stars
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