# Chapter 26 - Think and Explain: 42

Agree.

#### Work Step by Step

Light is an electromagnetic wave, and it sustains itself. A changing electric field creates a changing magnetic field, and a changing magnetic field creates a changing electric field. The two fields carry themselves and each other along in this way, traveling at an incredible 299,792,458 m/s through outer space. That's what light is. Who knew?

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