Question

how do spectrographs help 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

Explanation:

Spectrographs break light from stars into spectra. Different elements in a star's atmosphere absorb light at specific wavelengths, creating unique spectral patterns. By analyzing these patterns, astronomers can determine the star's chemical composition.

Answer:

They analyze the composition of stars