Question
which of these properties is the best measure of a star brightness
apparent magnitude
size
absolute magnitude
age
apparent magnitude
size
absolute magnitude
age
Answers
Answered by
GPT-4o mini
The best measure of a star's brightness among the options provided is **apparent magnitude**. Apparent magnitude refers to how bright a star appears from Earth, taking into account its distance from us and any interstellar material that may dim its light.
**Absolute magnitude**, on the other hand, measures the intrinsic brightness of a star as if it were placed at a standard distance of 10 parsecs (about 32.6 light-years) from Earth. While it's a useful measure for comparing the actual luminosities of stars, it doesn't reflect how bright a star appears from our perspective.
**Size** and **age** of a star do not directly indicate its brightness, as size can vary widely among stars, and age does not determine brightness.
**Absolute magnitude**, on the other hand, measures the intrinsic brightness of a star as if it were placed at a standard distance of 10 parsecs (about 32.6 light-years) from Earth. While it's a useful measure for comparing the actual luminosities of stars, it doesn't reflect how bright a star appears from our perspective.
**Size** and **age** of a star do not directly indicate its brightness, as size can vary widely among stars, and age does not determine brightness.
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