Astronomers think they have identified the remnant of a supernova recorded by Chinese astronomers in AD 386.
Astronomers have found the gamma-ray-emitting remains of three exploded stars, and the remnants might reveal the origin of cosmic rays.
You'll be entering uncharted territory when you seek out this little known 'Shadow of the Veil' in Cygnus this summer.
Take a look at this supernova remnant from radio waves to x-rays to see multiple features of its bubble-like expanding shock wave. Supernovae — the dramatic explosions of massive stars ending their lives — can outshine their host galaxies for weeks, allowing them to be seen across millions of light-years of empty space. On a…