Figure 22-26: R I V U X G
Variety in Spiral Arms The differences from one spiral galaxy to another suggest that more than one process can create spiral arms. (a) NGC 628 is a grand-design spiral galaxy with thin, well-defined spiral arms. (b) NGC 4414 is a flocculent spiral galaxy with fuzzy, broken, and poorly defined spiral arms.
Variety in Spiral Arms The differences from one spiral galaxy to another suggest that more than one process can create spiral arms. (a) NGC 628 is a grand-design spiral galaxy with thin, well-defined spiral arms. (b) NGC 4414 is a flocculent spiral galaxy with fuzzy, broken, and poorly defined spiral arms.
(a: Gemini Observatory—GMOS Team; b: Olivier Vallejo [Observatoire de Bordeaux], HST, ESA, NASA)