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Pluto & dwarf planets ↗
The IAU three-criteria rule explained.
Solar system · Question
How old would you be on another planet?
A "year" just means one full orbit around the Sun — and that takes wildly different amounts of time depending which planet you're standing on. Enter your age below to find out.
Visual model
Your age, recalculated.
years old on Earth
Measurable fact
Orbital periods, in Earth time.
Misconception check
Quick check.
Quick check
Go deeper
Keep exploring.
Orbits
Why don't planets fall into the Sun?
What actually keeps a planet orbiting for that long.
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Solar system model
Watch every planet's real relative orbital speed in the 3D model.