A Galaxy Crashes at 2 Million MPH, Creating One of the Most Powerful Shock Waves Ever Seen The Daily Galaxy --Great Discoveries ChannelWEAVE spectrograph uncovers dual nature of galaxy shock Phys.org2-million-mile-per-hour galactic crash reawakens a dangerous 'cosmic crossroads' Yahoo! VoicesAstronomers spot 1 of the most powerful 'sonic booms' in the universe as massive galaxy crashes into its neighbors Livescience.comThe shock sound wave from the collision of galaxies reached the Earth — MNRAS Eurasia Daily