GRADES 6–8 · 30 MINUTES

What belongs in orbit?

Goal: Distinguish functioning spacecraft from human-made orbital debris and explain a consequence of collision. Materials: paper and pencils.

Predict · 5 minutes

Is everything orbiting Earth useful? Write an answer and one question.

Sort · 10 minutes

In small groups, label each scenario “active spacecraft,” “orbital debris,” or “not enough information.” Explain your evidence.

1. A weather satellite sends usable images to meteorologists.
2. A broken satellite no longer works and remains in orbit.
3. A discarded rocket stage remains in orbit after releasing its payload.
4. A fragment from a spacecraft collision circles Earth.
5. A satellite has been silent for ten minutes; nothing else is known.

Discuss · 10 minutes

Why might a small fragment be a problem? How might one collision create more hazards? How does preventing debris differ from removing it?

Exit ticket · 5 minutes

Define orbital debris, name a satellite service, and describe one way to prevent future debris.

Educator notes

Suggested answers: 1 active; 2–4 debris; 5 insufficient information. Silence alone does not prove that a spacecraft is defunct. Human-made debris differs from natural meteoroids. Look for explanations connecting fragments with future collision risk.

Sources and further reading

ESA Clean Space · Secure World Foundation

Original introductory activity from Space Conservancy. Draft educational resource; not reviewed or endorsed by the linked organizations. No formal curriculum standards alignment is claimed.