This allows you to see through certain materials, as infrared passes through them in a way visible light (which is all our eyes perceive) cannot. Special types of equipment can capture infrared radiation, including night vision goggles and thermal cameras. About half of the energy that arrives on the Earth from the Sun arrives as infrared, for example. The world is saturated in infrared, but because we don’t see it, we don’t usually think about it. Infrared sits right below visible light in the electromagnetic spectrum, and is sometimes referred to as “heat radiation,” because that’s how we feel its effects.
