The third way that heat energy moves is through radiation, energy carried from the Sun to us by electromagnetic waves. To scientists, radiation means any kind of light ray, whether visible or invisible (like ultraviolet or infrared light). Hot things glow and give off light which carries the heat away, and that is just how the Sun heats the Earth. Radiation can be harmful in high amounts, and solar radiation is largely absorbed by the stratosphere, a layer of the Earth's atmosphere. The ozone layer is located in the stratosphere.

Entry 23: Would people or plants be protected from radiation on the Moon? Write why or why not in your Agronaut Log.

One neat thing about light and heat energy is that they can be changed into one another. Light from the sun can also warm our bodies when we are standing outside in the sunlight. And, heat from a fireplace also provides light in the flames.

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