For nearby galaxies, determining the rotation curve allows us to calculate the mass.
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Q3: Collisions between galaxies have little effect on
Q7: Both spiral and elliptical galaxies seem to
Q8: The total mass of a galaxy tends
Q9: As with stars, binary galaxy pairs are
Q11: Head- tail radio galaxies reveal their motion
Q13: Galactic collisions mostly involve interactions between gas
Q14: Most of the matter in the universe
Q15: There are large amounts of superhot intergalactic
Q16: When galaxies collide, the large- scale galactic
Q17: The stability of clusters of galaxies suggests
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