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Future-Ready

Living Off the Land

You can't pack enough air, water, or fuel to reach Mars. So In-Situ Resource Utilization (ISRU) makes them from the planet itself.
🧳The Impossible Suitcase
❌ Bring it ALL from Earth heavy payload heavy fuel needs MORE fuel → too big to launch ISRU ✅ Make it on Mars light rocket → cheap & possible to launch
Every extra kilogram of water and fuel makes a rocket too heavy. ISRU means "use what's already there," so the launch stays light.
⛏️What Mars Gives Us
🟤REGOLITH
What it isLoose, rusty, dusty soil over bedrock
UseBake it into bricks for shelters
🧱 walls · 🛡️ radiation shield
🧊WATER ICE
H₂O
What it isFrozen water buried in the soil
UseMelt & clean it to drink
💧 drinking water · 🔋 raw material
💨CO₂ AIR
~95% CO₂
What it isThin air that's ~95% carbon dioxide
UseTurn it into oxygen & fuel
🫁 oxygen · 🚀 rocket fuel
🏭The Chemistry: Air, Water & Fuel
⚡ ELECTROLYSIS water (H₂O) split by electricity 🫁 Oxygen Hydrogen → 🔬 MOXIE (from air) CO₂ air in strips off oxygen 🫁 Oxygen 🔥 SABATIER REACTION CO₂ air Hydrogen hot reactor 🚀 Methane fuel 💧 + water ⛽ PROPELLANT = fuel + oxygen 🚀 Methane to BURN 🫁 + Oxygen to burn it
A chemical plant melts ice and detoxifies it (Martian soil holds poisonous perchlorate salts), uses electrolysis to split the clean water into oxygen + hydrogen, and runs the Sabatier reaction over a hot catalyst to brew methane from CO₂ air — that's propellant production. It needs lots of power and cryogenic storage, and no such plant has been built off Earth.
🔴Proof It's Real: MOXIE on Mars
MOXIE CO₂ O₂ out
🛰️ NASA proved one ISRU step works — at instrument scale
A toaster-sized box called MOXIE rode the Perseverance rover
In 2021 it made the first ever oxygen on another planet
16 runs, ~122 g total, ~12 g/hour peak, finished 2023 — a proof of concept, not a crew supply
🔑Key Terms
🪐ISRU Making some supplies (water, air, fuel) from materials found right where you are, so less has to be launched from Earth.
🟤Regolith The loose, dusty, rocky soil covering Mars and the Moon — engineers are still testing whether it can be pressed or printed into building blocks.
🧊Water Ice Frozen water buried in Martian soil that can be melted and cleaned to drink.
⚡Electrolysis Using electricity to split water into breathable oxygen and hydrogen gas.
💨Carbon Dioxide CO₂ — the gas that's about 95% of Mars's thin air; raw material for oxygen and fuel.
🔥Sabatier Reaction Combines carbon dioxide with hydrogen over a hot catalyst to make methane fuel plus water — it needs power, heat and hydrogen from cleaned water.
🔬MOXIE A toaster-sized NASA experiment that made oxygen from Martian air — 16 runs, about 122 g total, 2021–2023.
⭐ Remember: ISRU lets explorers "live off the land" — turning Martian dirt and thin air into water, oxygen, and fuel is the key that unlocks deep space and the trip home!
✏️ ClickClass Anchor Chart · Living Off the Land: In-Situ Resource Utilization
From ClickClass — hundreds of free printables at clickclassedu.com/printables