Pangea Ultima Guest: Christopher Scotese, Emeritus Professor, Earth & Environmental Sciences, University of Texas at Arlington, and Director, PALEOMAP Project Thanks to modern technology, we can see just what the Earth's continents used to look like, and predict where they might move next. Moving the Sun Guest: Matt Caplan, Assistant Professor, Physics, Illinois State University A stellar engine is a theoretical machine that could be used to move the earth across the galaxy in the face of imminent planetary destruction.