Astronomers spot 1 of the most powerful 'sonic booms' in the universe as massive galaxy crashes into its neighbors Livescience.com2-million-mile-per-hour galactic crash reawakens a dangerous 'cosmic crossroads' Space.comPowerful telescope captures rogue galaxy colliding with another at 2 million mph Yahoo! VoicesTwo million mph violent galaxy collision in space ...Tech and Science Daily podcast Evening StandardTwo-million-miles-per-hour galaxy collision seen in detail Irish Independent