If a massive elliptical galaxy ($>10^{12} M_ $odot$) were actively forming stars, how would its current Star Formation Rate (SFR) compare to a moderate spiral galaxy ($1-3 M_ $odot/year)?
Answer
It would be effectively approaching zero, perhaps $10^{-3} M_ $odot/year or less
Massive ellipticals have an SFR that is negligible on cosmological timescales, vastly lower than the consistent output seen in actively star-forming spiral galaxies.
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