In this lesson from Yale's Rocket Science for Everyone, astronomer Marla Geha draws together the course's three prior lessons on Low Earth Orbit, Medium Earth Orbit, and Geosynchronous Earth Orbit into a single comparative overview. The lecture examines how satellites are distributed across these orbital bands and how each region's altitude and orbital speed suit it to different functions, from crewed spaceflight to navigation to broadcasting. As a synthesis lesson, it consolidates the orbital mechanics concepts built up across the earlier lessons before the course moves toward the physics of rocket propulsion needed to reach these orbits in the first place.