brightness
Quick Summary
In astronomy, a star's brightness is measured using magnitudes. There are two main types: apparent magnitude, which is how bright a star appears from Earth, and absolute magnitude, which is the star's intrinsic brightness if viewed from a standard distance of 32.6 light-years.12
Astronomers use a scale where lower numbers indicate brighter objects. For instance, a first-magnitude star is 100 times brighter than a sixth-magnitude star. Modern instruments can detect stars much fainter than the human eye can see. The total radiation emitted by a star across all wavelengths is known as its bolometric magnitude, providing a measure of its true energy output. The Sun is considered a typical star in terms of its mass, size, and intrinsic brightness.345
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