USAAAO — 2026 First Round

Consider two galaxies: Galaxy S is a spiral galaxy with blue spiral arms. Galaxy E is an elliptical galaxy with no blue stars, only red stars. Which of the following statements are likely TRUE? (I) We can find planetary nebulae in both galaxies. (II) Galaxy S is likely to have ongoing star formation. (III) Galaxy E is likely to have ongoing star formation. (IV) Type II supernovae are more likely to be found in Galaxy S. (V) Type Ia supernovae are likely to be found only in Galaxy E.