A complete, illustrated astronomy course. Pick a chapter to read, then explore it live in 3D.
The Sun & Planets
Big Ideas
Reference
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How to explore 🛰️
Drag to orbit the camera around the system.
Scroll / pinch to zoom in and out.
Click a planet — the camera flies in, locks on, and follows it as it orbits. Open its data sheet alongside.
Time slider speeds up or slows down the orbits — drag it to 0 to freeze time.
Real size shows the true relative sizes of the planets (they get tiny!).
Fly to… jumps the camera straight to any body.
📚 Library (top-right) opens the full illustrated textbook — every planet plus chapters on gravity, orbits, the asteroid belt, comets, eclipses, the search for life and more, each with an end-of-chapter quiz.
Tip for class: pause time, switch on Real size, and ask students to find Mercury. It teaches just how empty space really is.