Intergalactic Collisions Created Milky Way’s Spiral ArmsThe Milky Way’s spiral arms formed due to two intergalactic crashes with the nearby dwarf elliptical galaxy Sagittarius over the last two billion years and a third collision is dueSavePrintEpoch Times Staff9/14/2011|Updated: 10/1/2015Share this articleLeave a commentEpoch Times StaffAuthorAuthor’s Selected ArticlesDay in Photos: Earthquake in Guatemala, Military Exercises in Taiwan, and Sand Sculpture MuseumJul 09, 2025Texas Residents Pull TogetherJul 08, 2025Day in Photos: Heavy Rains in India, Wildfire in France, and Harvesting Jasmine Flowers in EgyptJul 08, 2025How a ‘Perfect Storm’ Created a TragedyJul 08, 2025Related TopicsScienceSpace Astronomy