Home▸Aerospace Engineering & Orbital Mechanics▸How to Build in Space

🛰️ How to Build in Space

An orbital assembly yard where a robotic arm bolts truss segments to a growing space station while an astronaut works EVA — toggle RCS station-keeping off to watch uncontrolled angular-momentum tumbling take over.

Aerospace Engineering & Orbital Mechanics3DAdvanced60 FPS

A robotic arm bolts truss segments and solar-array panels onto a growing space station core while an astronaut works alongside on a tether — switch off RCS station-keeping to watch the unbalanced structure tumble under conserved angular momentum.

🔬 What It Demonstrates

Every mass bolted on off-center shifts a station's inertia tensor; without active reaction-control thrusters, that produces uncontrolled tumbling and precession, which is why real assemblies rely on RCS and momentum management during EVA construction.

🎮 How to Use

Drag the assembly progress slider to build the truss and unfurl solar arrays step by step, pose the robotic arm's reach, and toggle RCS station-keeping and the EVA astronaut to see how construction and attitude control interact.

💡 Did You Know?

The ISS was assembled over more than a decade from 40+ flights, with Canadarm2 and spacewalking astronauts berthing multi-tonne modules to millimetre precision — with no floor, no friction, and no room for error.

⚙ Under the hood

space stationorbital mechanicsroboticsastronautsengineeringsimulationThree.js

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install