Two-Star Collision Yields Three-Ring Nebula. ChallisSupernova 1987A occurred in the Large Magellanic Cloud, a galaxy only 160,000 light years from Earth. The outburst was visible to the naked eye, and is the brightest known supernova in almost 400 years.
Interacting Galaxies: super massive black hole kicked out of it's parent galaxy!?!?!!!
Hydrogen in M51, NGC 5194. Perhaps the first spiral nebula, M51 is a large galaxy, over 60,000 ly across, with a readily apparent spiral structure. M51 is a part of a well-known interacting galaxy pair, its spiral arms and and dust lanes clearly sweeping in front of companion galaxy NGC 5195 (top).