Electromagnetic radiation, which includes light, radio waves, X-rays, and gamma rays, travels at the speed of light in a vacuum. This speed is a fundamental constant in physics and is denoted by the letter c.

Therefore, magnetic radiation, as part of the electromagnetic spectrum, travels at the speed of light:

* c = 299,792,458 meters per second (approximately 186,282 miles per second).

It's important to remember that magnetic fields are not the same as electromagnetic radiation. While they are related, they have different characteristics and propagate in different ways.