How do spectrographs astronomers classify stars? they determine the size of stars. they evaluate the color of stars. they measure the brightness of stars. they analyze the composition of stars.

Answer

They evaluate the color of stars

Explaination

Astronomers’ classification of stars is based on their physical properties that include the color, the temperature, size, composition and brightness. Because different stars have different chemical compositions, Astronomers utilize spectrographs to know the elements found in the star. This device breaks light into colors and forms an image of the resulting spectrum. The brightness of a star is determined by both its size and temperature, and the two description on star brightness are its apparent brightness and its absolute brightness.

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They analyze the composition of stars.

ice to water 1 water to vapour 2 latent heat