Infrared Light: Heat You Can’t See

Infrared light lies just beyond red on the spectrum, invisible to human eyes.
It carries heat energy, which is why you can feel sunlight warmth even when it looks bright white.
Night-vision cameras detect infrared, turning heat into visible images.
Remote controls use infrared signals to communicate with TVs and devices.
Infrared astronomy reveals cool stars, dust clouds, and hidden regions of space.
Medical thermal imaging uses infrared to detect circulation issues and inflammation.
Infrared wavelengths are longer than visible light, ranging from 700 nanometers to 1 millimeter.
Greenhouses trap infrared radiation, helping plants grow by holding in heat.
Snakes like pit vipers can sense infrared, letting them detect prey in the dark.
Everyday objects—from stoves to your skin—constantly emit infrared light as heat.