Respuesta :
Apparent magnitude because Apparent is kinda like when something is obvious. So that's how I think of it.
Answer:
a. apparent magnitude
Explanation:
Apparent magnitude is a measure of the brightness of a star (that is, amount of light) received on Earth. Star's apparent magnitude depends on:
- star luminosity
- star distance from Earth
- extinction of the light, for example, caused by interstellar dust.