Northern Lights times 1 million!
Astronomers have reported seeing an aurora on a 'failed' star (a brown dwarf) 18 light years distant from Earth. This is in a distant (18 light years) constellation, within the Milky Way (diameter estimated at 100,000 light years).
To put the distances in perspective:
Milky Way galaxy (our home!) diameter 100,000 light years
Satellite galaxies of the Milky Way 0.08 million - 1.63 million light years
other 'local group' galaxies 1.6 - 3 million light years
Andromeda 2.56 million light years
nearest outside of the 'local group' of galaxies ~ 6 light years
astronomy, galaxies, physics, space, popular science, miscellany 1