Emilio is at an observatory and is examining a newly discovered star through a powerful telescope. He wants to find out how bright the star actually is. What information does he need to be able to determine

Emilio is at an observatory and is examining a newly discovered star through a powerful telescope. He wants to find out how bright the star actually is. What information does he need to be able to

determine the absolute brightness of the star?
Color and distance from Earth to the star
Color and temperature of the star.
Color and composition of the star
Apparent magnitude and distance from Earth to the star.

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