Mach 100+ collisions
Mach 100+ collisions
From Spitzer
This false-color composite image of the Stephan's Quintet galaxy cluster clearly shows one of the largest shock waves ever seen (green arc), produced by one galaxy falling toward another at over a million miles per hour. It is made up of data from NASA's Spitzer Space Telescope and a ground-based telescope in Spain.
Mach 1
Interesting comparisons when you don't think of sound in space.