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Planet facts & big questions
Real numbers, honestly scaled, and every one of them explorable in 3D. Start with a world, or start with a question.
The worlds
The famous moons
The big questions
How big is each planet compared to Earth?
What does it mean?
When is it happening?
How long does light take to reach…
How long would it take to get to…
The human frontier
The bigger picture
✓ Facts verified July 2026
Every figure on this page is a real, rounded value checked against primary sources. Found something out of date? See how we keep it accurate.