In this lesson from Yale's Rocket Science for Everyone, astronomer Marla Geha introduces Low Earth Orbit, the region of space closest to Earth and home to satellites such as the International Space Station and the Hubble Space Telescope. The lecture explains what distinguishes low Earth orbit from other orbital regions, including the altitudes involved and the orbital speeds required to stay aloft against Earth's gravity. As part of a course aimed at a general audience with no physics background required, the lesson builds foundational intuition about orbital mechanics that later lessons extend to medium and geosynchronous orbits and to the physics of rocket propulsion itself.