The third angel sounded his trumpet, and a great star, blazing like a torch, fell from the sky on a third of the rivers and on the springs of water-the name of the star was Wormwood. A third of the waters turned bitter, and many people died from the waters that had become bitter.
Also, in the beginning of chapter nine, a star that had fallen from the skies (presumably Wormwood) had been given the key to the abyss, and opened it. Letting all the things in hell free.