Spiral Density Wave Theory and Self-Sustaining Star Formation Are Ways

Spiral density wave theory and self-sustaining star formation are ways to explain why ____.

A) stars orbit the galaxy with different periods at different distances from the center
B) sun-like stars are evenly distributed through the disk of the galaxy
C) dark matter affects the orbit of stars outside the visible disk of the galaxy
D) molecular clouds are compressed forming young stars along spiral arms
E) the central bulge of the galaxy has a "bar" shape

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