Question

To calculate the luminosity of a star it is necessary to know the:A. star’s brightness and colorB. distance of the star from Earth and its mass.C. the brightness of the star and its distance from EarthD. the temperature and mass of the star

Answer 1

To calculate the luminosity of a star it is necessary to know the _____.

Step-by-step explanation:

It is known that,

Luminosity = brightness x 12.57 x (distance)².

Then, the luminosity of a star is determined by measuring its distance and its apparent brightness.

Hence, the answer is option C, the brightness of the star and its distance from Earth.