Electromagnetic radiation does travel at slower speeds through normal matter.

Anyway, if those bombs had been nuclear, the radiation would have traveled a lot farther than this already.

All this radiation is traveling in the same direction, and the null vector plays the role of a wave vector.

As this radiation travels toward the Earth, the atmosphere absorbs about 25% of it, and about 25% is reflected by the clouds back into space.

In this hot, dense situation, the radiation (photons) cannot travel far before interacting with one of these charged particles.

Another way that radiation can travel is in the form of tiny particles.

This radiation travels outward at the speed of light.

We are linked to you by the Dabney field, in which radiation travels much faster than light.

"And the subnuclear radiation from a million novae is traveling right behind the wave front."

The air mass coefficient can be used to help characterize the solar spectrum after solar radiation has traveled through the atmosphere.