1. Why can’t the evolution of galaxies go from elliptical to spiral? From spiral to elliptical?… 1 answer below »

1. Why can’t the evolution of galaxies go from elliptical to spiral? From spiral to elliptical? 2. What is the difference between an Sa and an Sb galaxy? Between an S0 and an Sa galaxy? Between an Sb and an SBb galaxy? Between an E7 and an S0 galaxy? 3. Explain how the rotation curve method of finding a galaxy’s mass is similar to the method used to find the masses of binary stars.  

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