One of the most controversial (open ended argument) topics is how the dinosaurs died, here are what some scientists think happened to the dinosaurs. For example, one theory is that a star exploded and the radiation came into earth's air and made the plants poisonous. When the herbivores and carnivores ate, the radiation (poisonous gasses) killed them. Another possible way, is that plants died and herbivores couldn't eat. The herbivores died and eventually, the carnivores died because they killed each other, or starved. Paleontologists' favorite idea, is that an asteroid came into the earth's atmosphere, crashed and caused a few earthquakes. The earthquakes rattled volcanoes and they erupted, sending ash to blot out the sun. The plants couldn't grow and the herbivores and carnivores, then couldn't eat. As you can see, all of these theories center around plant life dying off, and dinosaurs not being able to eat anything.