This is a space shockwave traveling 1000 times faster than sound

The Harvard-Smithsonian Center for Astrophysics reports on the discovery of a "reverse shock wave racing inward at Mach 1000" in the Tycho's supernova remnant, making its particles glow as you can see in the photograph above. If you think the idea of a shockwave traveling inward is counterintuitive, you aren't alone.… » 11/25/13 11:06pm 11/25/13 11:06pm