Verified Answer :

EarlCiel

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.

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