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 ArticlesUnpacking Musk’s Third Party BidJul 10, 2025Day in Photos: Migrants in the English Channel, Beautiful Sailboats, and a Baby Pygmy HippoJul 10, 2025FTC Probes Gender ProceduresJul 10, 2025Day in Photos: Earthquake in Guatemala, Military Exercises in Taiwan, and Sand Sculpture MuseumJul 09, 2025Related TopicsScienceSpace Astronomy