There are alternative explanations
Typically these big bang metaphysics theorists ignore the better predictive alternatives. Plasma cosmology has an explanation of the observed inadequate gravitational attraction, that does not need dark matter. As for the 31Myr cycles of extinctions and the 250Myr cycles of major extinctions (including that for the dinosaurs), all can explained by the solar system's wobble through the plane of the Milky Way as it turns about its axis and the time of rotation of the solar system around the galaxy (remember Feynman's plates and their wobble). Wobbles cause the earth to pass through rings of objects such as the Opik-Oort cloud in the plane of the solar system or the plane of the galaxy large enough to cause extinction events if the earth is unlucky enough to collide with one.
Theoreticians are just grasping at straws, hope-wishing, desparately looking for further fanstasies to bolster their belief in their dreamworlds.
Biting the hand that feeds IT
