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Astronomy & Space; Astronomy; December 11, 2015; Did ‘dark matter’ or a star called Nemesis kill the dinosaurs? December 11, 2015 by Konstantinos Dark matter is a hypothetical type of matter composing the approximately 27% of the mass and energy in the observable universe that is not accounted for by dark Past Lectures Dr. Lisa Randall — Dark Matter and the Dinosaurs: The Astounding Interconnectedness of the Universe (Science Salon # 1)Even more controversial is her assertion in both the book and the interviews that the dark matter model might be the cause for periodic extinctions in the fossil record.“The key message of my paper is that dark matter may not exist and that phenomena attributed to dark matter may be explained by the gravitational polarization of If there is a thin dark disk coursing through the “midplane” of the galaxy, Randall and Kramer argue, then it will gravitationally pinch other matter inward Huge supercolliders aren’t the only way to search for new physical phenomena. A new generation of experiments that can fit on a tabletop are probing the Under phylogenetic nomenclature, dinosaurs are usually defined as the group consisting of Triceratops, Neornithes [modern birds], their most recent common ancestor A long time ago there were dinosaurs. Big dinosaurs and small dinosaurs. Dinosaurs with horns on their heads or spikes down their backs. Dinosaurs with long, long Continuous and discontinuous variation Variation, the small differences that exist between individuals, can be described as being either discontinuous or continuous.