The solar system in 3D

Watch the eight planets orbit the Sun at their real relative speeds, with each planet's distance, year and speed, and Kepler's third law.

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Questions students ask

What is Kepler's third law?

The square of a planet's orbital period is proportional to the cube of its distance from the Sun: T² = a³ in years and astronomical units.

How long is a year on Mars?

About 687 Earth days (1.88 years).

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