Before Johannes Kepler’s Third Law, the motions of the planets around the Sun were a mystery. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Kepler's laws show the effects of gravity on orbits. They apply to any object that orbits another: planets orbiting the Sun, moons orbiting a planet, spacecraft orbiting Earth.

Four centuries ago, Johannes Kepler established three laws of planetary motion that accurately describe how planets in the solar system orbit the Sun. That might be enough for most; however, befitting ...

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