in General Knowledge, Science All Galaxies, regardless of… by Chirag Chauhan June 30, 2018, 3:46 pm 41 Views All Galaxies, regardless of size, rotate once every billion years. Galaxies Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website By using this form you agree with the storage and handling of your data by this website. *