There is very little interstellar gas or dust in most elliptical galaxies.
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Q9: Quasars can emit as much as thousands
Q10: While our two companions, the Magellanic Clouds,
Q11: Active galactic nuclei are usually powered by
Q12: Irregular galaxies, although small, have large H
Q13: The latest evidence from 2MASS suggests our
Q15: Most galaxies are spirals.
Q16: If the redshift is an accurate indication
Q17: Most galaxies are members of some sort
Q18: Type I supernovae can be used to
Q19: Orientation counts; if looking down the jets
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