In the self-propagating star formation theory
A) spiral arms are formed and sustained primarily by the actions of solar-mass stars because there are so many more of them than there are high-mass stars.
B) spiral arms are poorly defined because they are formed and sustained primarily by the actions of short-lived massive stars.
C) the passage of dust clouds through the spiral arms triggers star formation.
D) spiral structure results with thin, well-defined arms.

Question

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The Answer of In the self-propagating star formation theory
A) spiral arms are formed and sustained primarily by the actions of solar-mass stars because there are so many more of them than there are high-mass stars.
B) spiral arms are poorly defined because they are formed and sustained primarily by the actions of short-lived massive stars.
C) the passage of dust clouds through the spiral arms triggers star formation.
D) spiral structure results with thin, well-defined arms.

In the Self-Propagating Star Formation Theory