If supercomputer models are correct, then higher concentrations of hydrogen could have formed a wall and caused the heliosphere around Earth to collapse. This could have allowed more cosmic radiation to penetrate to Earth’s surface, resulting in changes to the flora and fauna. If this did occur, such an increase in cosmic rays, with elevated levels of radiation, could have directly killed the dinosaurs. Another scenario is that the rays negatively affected the vegetation eaten by the herbivorous dinosaurs and other animals. As carnivorous dinosaurs no longer had any prey, they also would have died off.