Summary
Mr. DeMaio explores the evidence for a possible ninth planet far beyond Neptune. A short, high-energy Mr. DeMaio explainer (13 min) — great as a lesson hook, a review at a station, or a quick brain-boost the whole class can watch together.
Viewer safety
All ages
Common Sense Media — not yet ratedIMDb Parents Guide — not yet rated
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Teaching resources
Discussion questions
Discussion
Use these after watching “Is There a Planet 9?.”
- What is the most surprising or important thing you learned in this video?
- Where might this come up in real life — looking up at the night sky or exploring the natural world?
- What is one question you still have, and how could you find out the answer?
Quick work-a-long
Vocabulary: planet, star, orbit, evidence, scale.
Try it: 1) Write down two facts you learned in “Is There a Planet 9?” and one question it made you wonder about. 2) Draw or explain the main idea to a partner in your own words.