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Planetary Motion

Orbits

An orbit is the path an object in space travels around another. Lots of objects in the Universe orbit others. The Moon orbits the Earth.

Orbit of dwarf planets Pluto and Charon

Motion

Motion is when something moves from one place to another over time. 

Everything around us is always moving, from tiny particles to huge galaxies. 

In physics, we describe motion using ideas like distance, speed, and acceleration.

Silhouette of a cyclist in motion during sunset, with arrows indicating the direction of movement and wheel rotation. The word 'Motion' is displayed at the top of the image
This work by The Schools' Observatory is licensed under All rights reserved