Which galaxy type is most likely to have the highest star formation rate and most open spiral arms?

In the spiral-galaxy sequence, Sa galaxies have tightly wound arms and relatively little ongoing star formation, while Sc galaxies have loosely wound, open arms and more active star formation. The “S” identifies a spiral galaxy, and the later type “c” indicates the more open-armed, gas-rich form. Therefore, Sc is most likely to have the highest star formation rate and most open spiral arms.

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