The Greatest Fireworks in the Universe

Years ago I had an opportunity to visit the historic Grucci fireworks factory on Long Island. Artisan chemists there were hard at work crafting reactions that would detonate with just the right color and just the right shape; the whole place was surrounded by a high berm to contain any accidental explosions. Yet I couldn't help thinking--the universe creates even more spectacular colors, on a far grander scale, with no guidance and no effort. All we have to do is look in the right location. S