An astronomer observes a set of galaxies that are exceptionally blue and have a large fraction of interactions.These galaxies are most likely:
A) at high redshifts.
B) inside galaxy clusters.
C) ellipticals.
D) gravitationally lensed.

Question

Quizplus · Accepted Answer

Galaxies that are exceptionally blue and have a large fraction of interactions are likely to be at high redshifts. This is because at high redshifts, galaxies tend to have more interactions and the colors appear bluer due to the Doppler shift.

An Astronomer Observes a Set of Galaxies That Are Exceptionally