The Lost Worlds of Planet Earth Ortelius hypothesized the idea that land masses may have been connected in the past, Alfred Wegener who hypothesized the idea of a super-continent Pangaea and continental drift despite the prevailing idea of flooded land-bridges at the time, and Bruce C. Heezen and Marie Tharp who discovered the Mid-Atlantic Ridge that supported the theory of plate tectonics. Tyson describes how the landmasses of the earth lay atop the mantle, which moves due to the motion and heat of the earth's outer and inner core. Tyson moves on to explain the asteroid impact that initiated the Cretaceous–Paleogene extinction event, leaving small mammals
Distant Past sleeps, Susan inspects his truck and her worst suspicions are confirmed when she finds the bottle of pills—and sees who prescribed them. This episode attracted 18.64 million viewers in its original US airing. 13.86 million viewers watched this episode in the UL, finishing 3rd in the week it was aired. Although credited, Katherine Mayfair (Dana Delany), Dylan Mayfair (Lyndsy Fonseca), Danielle Van De Kamp (Joy Lauren), Preston Scavo (Brent Kinsman), Porter Scavo (Shane Kinsman), Parker Scavo (Zane Huett), and Kayla Scavo (Rachel Fox) do not appear in this episode. Distant Past "Distant Past" is the 78th episode of the ABC