Why is a thermal imaging camera able to show warm objects in complete darkness?

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Question

Why is a thermal imaging camera able to show warm objects in complete darkness?

Accepted Answer

Warm objects emit infrared radiation whether or not any light is present — The camera detects emission rather than reflection.

Answer

Darkness makes objects emit more radiation

Answer

Warm objects emit infrared radiation whether or not any light is present

Answer

Warm objects glow with visible light too faint to see

Answer

The camera shines invisible light onto the scene

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