Space is full of wonder, but it’s also a place that pushes every human need to the limit. When you teach a lesson on Life in Outer Space, you’re helping students translate sci-fi curiosity into real science: how do we breathe, eat, sleep, stay healthy, and even go to the bathroom when gravity disappears? Those questions are perfect for middle schoolers — they’re concrete, a little silly (yes, students will ask about “space potties”), and deeply scientific.
If you want everything already planned for you, check out the ready-made lesson I created that covers these topics with embedded videos, activities, and an auto-graded exit ticket. It’s a plug-and-play way to teach how humans meet their needs in space. Life in Outer Space – How Humans Meet Their Needs – Lesson
Below are classroom-friendly ways to teach the major needs of humans in space — with hands-on activities, discussion prompts, and assessment ideas.
1) Air: how astronauts get oxygen and remove CO₂
Why it matters for class: Air is the obvious starting point. If students understand how the ISS keeps breathable air, the rest of life-support systems make more sense.
Quick classroom activity: Build a simple “mini-ECLSS” demo. Use a closed container, a plant (or algae), and a chemical CO₂ absorber (soda lime packets or baking soda + vinegar demo) to show how oxygen and CO₂ can be balanced. Have students measure (or time) how long the air stays “safe” for a small sensor or a candle to burn. Then discuss why closed systems need continuous monitoring and recycling.
Technical note (teacher reference): Real spacecraft use an Environmental Control and Life Support System (ECLSS) that generates oxygen, removes CO₂, recovers water, and manages air quality — a great cross-curricular link to chemistry and engineering.
2) Water: conserve, filter, and recycle
Why it matters: Water is heavy and precious in space. Students love the counterintuitive fact that astronauts recycle much of their water.
Hands-on idea: Create a classroom water-recovery challenge. Give student groups “used” water (colored/dirty water), simple filters (coffee filters, sand, activated charcoal), and have them try to purify it to a “drinkable” standard. Tie the lab to conversations about mass, launch cost, and why recycling matters on long missions.
Teacher tie-in: Discuss the ISS Water Recovery System as a model and how engineers design for 99% recovery rates. That leads nicely into an engineering design task: design a compact, low-power filtration system for a small habitat.
3) Food: menu, packaging, and nutrition in microgravity
Why it matters: Eating in space is social, technical, and scientific. Food must be safe, balanced, and crumb-free.
Classroom activity: Conduct a “space menu design” project. Ask students to design a three-day meal plan that fits constraints: low crumbs, balanced nutrition, minimal prep tools, and limited water. As an extension, students can package one item and explain shelf life and preservation choices.
Resources: NASA and other space agencies provide background on astronaut nutrition and food prep on orbit — a real-world connection that helps students understand why food design is engineering too. Click here for more information on eating in space
4) Sleep, hygiene, and daily routines in microgravity
Why it matters: Microgravity changes sleep, personal care, and mental health patterns.
Quick demo + discussion: Have students try making routines for a “no floor” environment. They can design sleeping bags (tether points), plan hygiene routines (no-flow showers, sponge baths), and create schedules to protect circadian rhythms. For a simple demo, show short astronaut videos of sleep and hygiene aboard the ISS and follow with a reflection prompt: Which routine would you miss most on the station? Why? Click here to see multiple videos from the Canadian Space Agency as they demonstrating sleeping in space
5) Waste & toilets — yes, really discuss it
Why it matters: Waste management is engineering plus health safety.
Design challenge: Ask groups to design a toilet system that works in microgravity and minimizes mass and maintenance. Use constraints and materials lists and have students present their designs. Use videos of ISS toilet systems as a starting point so students can critique real tech and propose improvements.
6) Health risks: microgravity, radiation, and isolation
Why it matters: Students should know that living in space isn’t just logistical — it affects bodies and minds.
Activity: Case studies. Assign small groups a health topic (bone density loss, muscle atrophy, radiation exposure, crew psychology). Each group creates a one-page infographic explaining the risk, the underlying science, and countermeasures (exercise regimens, shielding, mission schedule design). This merges science, research, and communication skills. Alternatively, have each group create a short presentation about their health topic.
Assessment & classroom flow (teacher-friendly tips)
- Use predict–observe–explain sequences (short predictions before videos/demos).
- Collect learning via mini-lab reports and quick exit tickets asking for one claim + evidence.
- Consider a culminating project (design challenge or public “space fair”) where students present models, posters, or videos.
If you prefer everything scaffolded for you, the full lesson I created includes student and teacher slides, 15 ISS/astronaut videos embedded, a Predict/Observe/Explain activity, and an auto-graded exit ticket — great when you want turnkey instruction with strong student engagement. CLICK HERE to have a look at a ready-made lesson and activities.
Why students love this unit (and why teachers do, too)
The topic checks every engagement box: real-world relevance, hands-on design, ethical and scientific thinking, and just enough humor (space toilets!) to keep students curious. Teachers who use a ready lesson report that embedded videos and clear teacher notes make class flow and discussion effortless — excellent for brand-new or veteran teachers alike. CLICK HERE to have a look at a ready-made lesson and activities.
Final thought: connect wonder to real engineering
Teaching “life in space” gives students a chance to connect everyday needs to real engineering constraints. Whether you build mini-labs from scratch or use a ready-to-go lesson with embedded videos and assessments, the learning goal is the same: students should explain why every design choice matters in space.
If you want an easy way to run this lesson tomorrow, the module I created bundles slides, teacher notes, videos, activities, and an auto-graded exit ticket so you can spend class time facilitating learning — not prepping materials.
CLICK HERE to have a look. Print-ready. Just download and teach.
