Artist's concept of a light echo from a supernova that exploded in the nearby galaxy called the Large Magellanic Cloud (LMC), as seen from Earth more than two centuries after the original explosion. The echo is only part of a ring, because to be seen it must intersect with existing clouds of interstellar dust far from the explosion, which are not spaced equally within the large volume that the supernova light continues to expand into. P. Marenfeld and NOAO/AURA/NSF
