According to the theory of self-propagating star formation, the spiral arms of flocculent spiral galaxies are broad and poorly designed because
A) the spiral arms in these galaxies are strongly influenced by the black hole at the center of the galaxy.
B) the density wave has been disrupted by the bar across the center of the galaxy.
C) dust lanes occur in broad bands rather than in the narrow bands found in grand-design spirals.
D) the spiral arm segments are defined only by the relatively short-lived O- and B-type stars.

Question

Quizplus · Accepted Answer

The theory of self-propagating star formation suggests that the spiral arms of flocculent spiral galaxies appear broad and poorly defined because they are marked by the presence of short-lived, bright O- and B-type stars. These stars do not live long enough to maintain a consistent structure, leading to the less defined appearance of the spiral arms.

According to the Theory of Self-Propagating Star Formation, the Spiral