A physical principle stating that the intensity of radiation decreases with the square of the distance from the source. This fundamental law governs how brightness, gravitational force, and other phenomena weaken with distance throughout the universe.
The mathematical relationship was recognized in various forms since ancient times, but was formalized in physics during the 17th century. The term 'inverse square' describes how the effect is proportional to 1/distance², reflecting how influence spreads over expanding spherical surfaces.
The inverse square law is why stepping twice as far from a campfire makes it feel four times dimmer, not just twice as dim! This same rule governs everything from starlight to gravity - it's the reason we can measure distances to stars by comparing their apparent brightness to their true luminosity.
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