The planets of our solar system move in ellipses. We've known this, so we are told, ever since Johannes Kepler devised his laws of planetary motion in the early 1600s. While it's true that orbits are ...

In 1844 it was first recognized that the propagation of a solitary wave, known as a soliton, represents an unusual state of matter 1. Solitons have become ubiquitous in many fields of physics ...

The early-17th-century astronomer Johannes Kepler defined the basic rules governing planetary motion. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...