Revelation 8:11-12

11The name of the star is Wormwood; and a third of the waters became wormwood, and many people died from the waters, because they had become bitter (toxic).

12Then the fourth angel sounded [his trumpet], and a third of the sun and a third of the moon and a third of the stars were struck, so that a third of them would be darkened and a third of the daylight would not shine, and the night in the same way [would not shine].