I've seen things you people wouldn't believe. Hydrogen clouds in a far-away star system glowing from a supernova's last gasp

Exploding sun's shock wave may have sparked light from interstellar gas

More than 20 years ago a huge wave of energized interstellar gas was detected passing through the Big Dipper - or The Plough as it's known in the UK. Now astrophysicists think they've figured out the cause of the cosmic commotion: a ripple from a massive supernova explosion passing through the Milky Way....