Both spiral and elliptical galaxies seem to have dark halos of similar proportions relative to their visible matter.
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Q2: The Andromeda galaxy will eventually collide with
Q3: In the larger clusters, colliding galaxies tend
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
Q8: The total mass of a galaxy tends
Q9: As with stars, binary galaxy pairs are
Q11: Head- tail radio galaxies reveal their motion
Q12: For nearby galaxies, determining the rotation curve
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