Apparent brightness is the measure of how bright a star appears from Earth. It depends on both the star's intrinsic luminosity and its distance from Earth.
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Apparent brightness is measured in units of flux, typically watts per square meter.
It follows the inverse square law, meaning that as distance increases, apparent brightness decreases proportionally to the square of the distance.
Magnitude scale is used to quantify apparent brightness; lower magnitudes indicate brighter stars.
Apparent brightness can be affected by interstellar dust and gas, which absorb and scatter light.
It is different from absolute magnitude, which measures intrinsic luminosity independent of distance.