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
The Legend That Was Earth The Legend That Was Earth The Legend That Was Earth is a novel by science fiction author James P. Hogan; it was published in 2000 by Baen Publishing Enterprises. It includes several themes common to science fiction, such as dystopias, alien encounters, and the distinctions of personhood. At the onset of the story, aliens called Hyadeans have established contact and friendly business relations with Earth. They think Earth is fascinating because it so different from their own bleak, austere culture. Though they are highly interested in studying the planet and its cultures, Hyadeans are far more technologically advanced and have