The inverse square law states that the intensity of light or radiation from a point source decreases proportionally to the square of the distance from the source. This means if you double the distance, the intensity becomes one-fourth.
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The inverse square law applies to any point source of light, including stars and other celestial objects.
Mathematically, it is expressed as I ∝ 1/d², where I is intensity and d is distance.
This law explains why light from distant stars appears dimmer than closer ones.
It is crucial in determining luminosity and apparent brightness of astronomical objects.
The inverse square law also affects gravitational and electric forces just as it does light.