Back قائمة المجرات الحلزونية Arabic Rhestr galaethau troellog Welsh فهرست کهکشانهای مارپیچ Persian Liste de galaxies spirales French Daftar galaksi spiral ID 渦巻銀河の一覧 Japanese 나선은하 목록 Korean Список на спирални галаксии Macedonian Lista de galáxias espirais Portuguese Zoznam špirálových galaxií Slovak
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A spiral galaxy is a type of galaxy characterized by a central bulge of old Population II stars surrounded by a rotating disc of younger Population I stars. A spiral galaxy maintains its spiral arms due to density wave theory.