Summary
Explains orbital mechanics in approachable terms — why the moon orbits Earth, why Earth orbits the sun, and why orbits are essentially objects falling around each other due to gravity.
Viewer safety
All ages
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Teaching resources
Discussion questions
Discussion
- What keeps the moon in orbit around Earth? What would happen if gravity suddenly stopped?
- Why doesn't the moon crash into Earth if gravity is always pulling it toward Earth?
- What is the difference between Earth's rotation and the moon's orbit around Earth?
- If you launched a satellite from Earth, what would determine whether it stays in orbit or flies away?
Quick work-a-long
Vocabulary: orbit, gravity, velocity, satellite, inertia, circular motion.
Try it: Tie a small weight to a string. Swing it in a circle above your head. What happens if you let go? Relate this to why the moon stays in orbit — it is always 'falling' toward Earth, but also always moving forward.