How is the star formation rate of Elliptical galaxies often described?
Answer
Quiescent or dead
Elliptical galaxies are universally characterized in terms of their star formation activity as being 'quiescent' or 'dead.' This description reflects the reality that their average rate of star formation is far lower than that of spiral or irregular galaxies because they have expended or lost nearly all their cold, molecular fuel. While exceptional circumstances might permit an occasional, very low-level rate of star birth, for practical astronomical assessment, their star factories are considered effectively shut down. This contrasts strongly with irregular galaxies, which often experience vigorous, intense bursts of star formation due to their abundant cold gas reserves.
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