- A star's intrinsic luminosity (actual power output) is primarily determined by its size (radius) and surface temperature. Larger and hotter stars are more luminous. - The apparent brightness (how bright it appears to us) is inversely proportional to the square of its distance from the observer. A very luminous star can appear dim if it is far away, and a less luminous star can appear bright if it is close. - Therefore, apparent brightness depends on factors determining luminosity (size, temperature) and the distance.
The Brightness of a star depends on ______.
Asked in GPSC Prelims CSP 2 2019 · Topic: Space (Stellar Structure, Evolution, and Nucleosynthesis)
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