This TED-Ed companion resource explores how Earth’s axial tilt shapes seasons, climate cycles, and the planet’s long-term habitability. Students learn about the Big Whack, obliquity, Milankovitch cycles, Ice Age triggers, and the consequences of a world with no axial tilt. Includes 20 analytical discussion questions, a structured essay prompt, and a debate topic contrasting orbital cycles with greenhouse gas effects. Ideal for Earth science, astronomy, climate science, and geology lessons. P