Question

which is most useful in classifying stars? (1 point)
knowing the color and brightness of a star
knowing the size of a star
knowing the apparent magnitude of a star
knowing the movements of a star
check answer
remaining attempts : 3

Explanation:

Star color indicates its surface temperature and brightness (luminosity) helps in understanding its size and distance - related properties. These two factors are key in star - classification systems like the Hertzsprung - Russell diagram. Size alone doesn't fully classify a star, apparent magnitude is affected by distance and doesn't give full information about the star's nature, and star movements are less relevant for basic classification compared to color and brightness.

Answer:

knowing the color and brightness of a star