Skip main navigation

Does Kepler’s third law work on all celestial bodies?

In its original form, Kepler’s third law was developed to describe planetary orbits, that is, the orbits of planets such as earth, mercury, and venus around the sun. Today though, we know that Kepler’s third law applies to all systems with radial force that obey the inverse-square law. Comets, exoplanets (planets that orbit around other stars), moons and even satellites are subject to the forces described in Kepler’s law.

FutureLearn - Learning For Life

Our purpose is to transform access to education.

We offer a diverse selection of courses from leading universities and cultural institutions from around the world. These are delivered one step at a time, and are accessible on mobile, tablet and desktop, so you can fit learning around your life.

We believe learning should be an enjoyable, social experience, so our courses offer the opportunity to discuss what you’re learning with others as you go, helping you make fresh discoveries and form new ideas.
You can unlock new opportunities with unlimited access to hundreds of online short courses for a year by subscribing to our Unlimited package. Build your knowledge with top universities and organisations.

Learn more about how FutureLearn is transforming access to education

Related stories on FutureLearn