This is old news (May 08), but this picture is fantastic! More pictures at news.com.au.
The volcano had been dormant for 9,000 years near the coast of Chile erupted spectacularly, hurling liquefied metals and lightning many miles into the sky. The results, which you see here, is called a "dirty thunderstorm," and is quite rare. Nobody is certain what causes them, but according to National Geographic it's believed to be "the result of rock fragments, ash, and ice particles in the plume colliding to produce static charges—just as ice particles collide to create charge in regular thunderstorms."