Prepare a mission
Working hard gets hot.
Section 3 of 7
Diagnostic
The answer key for the quick check learners take before the theory.
Mission & depth
Mission: Surviving the environment · Academic depth: Grade 7 · Duration: 55–70 minutes
The mission
Space is not a good place to lose heat. There is no air to carry it away, so a spacecraft running its camera and radio has to get rid of that heat through its own structure. Your team will run the same demanding workload on two spacecraft and see how differently they cope.
One session of 55–70 minutes at Grade 7.
Teaching brief
What to say at Grade 7
These prompts come from the academic layer, so they change with the depth you selected.
- Theory
- State what you will compare between two runs. Stage intent: rates.
- Prediction
- Predict which run will differ and in which direction.
- Running the Twin
- Run a baseline and a comparison on the Twin. Runtime remains the frozen Twin; this plan does not execute physics.
- Checkpoint
- Record the difference you observed.
- Analysis
- Identify what changed and what stayed the same. Evidence intent: temperature/power plot + envelope/trade explanation.
- Engineering decision
- Recommend which option better meets the classroom criterion.
- Limitation
- Name at least one frozen-model limitation that this experiment cannot answer.
- Provenance
- Keep simulated, simulated_sensor, estimator_state, derived, reference, and measured distinct. Never label simulated as measured.
Diagnostic
Diagnostic answer key
Why does electronics running in space get hotter than the same electronics on Earth?
- ✓ There is no air to carry the heat away
- · Space is hot
- · Electricity works differently in space
Timing & facilitation
Timing
One session of 55–70 minutes. Adjust freely — the sequence matters more than the clock.
| When | Stage | What you are doing |
|---|---|---|
| 0 → 5–6 min | Mission | Set the role, objective, mission question, and success criterion. |
| 5–6 → 17–21 min | Preparation | Diagnostic, theory, and a written prediction before any run. |
| 17–21 → 20–25 min | Readiness | Learners confirm the local formative gate after preparation passes. |
| 20–25 → 35–45 min | Operate | Run the bounded baseline, then the candidate where comparison is disclosed. |
| 35–45 → 47–60 min | Evidence | Inspect provenance, select evidence, decide, state a limitation, and complete the formative assessment. |
| 47–60 → 53–68 min | Complete | Review the result band, reflect, and finalize local practice at any band. |
| 53–68 → 55–70 min | Recognition | Explain the local record and the separate future verified-recognition boundary. |
While they work
- The payload workload is identical in both runs. Any learner explaining the difference by the payload has not read the setup.
- The small satellite reaches a much higher peak. Ask what would happen to real electronics at that temperature.
- This is the same runtime as the shadow mission but a different scenario. There the driver was darkness; here it is the spacecraft working hard.
Can the learner explain the temperature difference in terms of the spacecraft, given that the workload was identical?
Misconceptions
Misconceptions to watch for
Authored lesson design — what a class reliably gets wrong here, and where you can catch it. Not a claim about any learner.
“The temperatures differ because one spacecraft's payload is working harder.”
The payload workload is identical in both runs. Send the learner back to the setup: any explanation resting on the payload has not read it.
Watch: evidence — The temperature and battery comparison between the two spacecraft · Code:
cause_effect_or_control_logic_reversal“The smaller spacecraft is the better design because it uses less energy.”
It also reaches a much higher peak temperature. Ask which limit decides whether the electronics survive the run at all.
Watch: the decision option "Recommend the smaller one because it uses less energy" · Code:
constraint_budget_or_tradeoff_omission“Space is cold, so a spacecraft cannot overheat.”
There is no air to carry heat away. Ask how the heat is supposed to leave, and let the class discover that radiating is the only route.
Watch: the "heat" diagnostic · Code:
cause_effect_or_control_logic_reversal
Review & extension
What a good reflection contains
Which spacecraft property most influenced temperature, and what physical measurement would you need before trusting the result?
- Attributes the temperature difference to the spacecraft, not to the payload, which is identical in both runs.
- Names the peak temperature reached by the smaller spacecraft and says what it would mean for real electronics.
- Distinguishes this scenario — the spacecraft working hard — from the eclipse mission, where the driver was darkness.
If they finish early, or go further
- Set the thermal limit (Grades 9–10 and above)
Choose a temperature you would refuse to exceed, justify it, then say which of the two spacecraft your limit rules out and by how much.
- Two causes, one symptom (Grade 8 and above)
This mission and the eclipse mission both end with a battery under pressure, for different reasons. Write one sentence for each that names its actual driver.
Home mission
Home mission: nowhere to put the heat
Find something at home that gets warm when it works - a laptop, a charger, a lamp. Find where its heat escapes. Then write one sentence on what would happen to it if there were no air around it at all.
Truth & feedback
Hold this line
- The temperature and battery numbers are produced by a model. Nothing here was measured on a real spacecraft.
- The two spacecraft are teaching profiles, not real hardware designs.
- This lesson does not show that either design would survive a real mission.
Tell us what did not work
Ten questions, answered locally. Nothing is submitted or tracked — you download the file and send it if you want to.
Informal educator feedback
This local-first form contains the ten approved pilot-review questions. It does not submit, track, or store data remotely. Optional name/contact should be handled outside this form only if a reviewer volunteers it.