As with stars, binary galaxy pairs are useful in finding their total mass.
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Q3: Collisions between galaxies have little effect on
Q4: The masses of most spiral galaxies, like
Q5: Because of the great masses and speeds
Q6: Mapping the intracluster gas is largely done
Q7: Both spiral and elliptical galaxies seem to
Q8: The total mass of a galaxy tends
Q11: Head- tail radio galaxies reveal their motion
Q12: For nearby galaxies, determining the rotation curve
Q13: Galactic collisions mostly involve interactions between gas
Q14: Most of the matter in the universe
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