Respuesta :
The information that can be determined by observing dark lines within the spectrum of a given star includes "the approximate size of the star" since the other options are unknown.
Answer:
the elements present in the star's atmosphere
Explanation:
The spectrum showing dark lines is an absorption spectrum. The dark lines actually indicated the energy absorbed by the elements present in the atmosphere of the star.
The elements absorb particular wavelengths and reach higher energy state. The absorbed wavelengths appear as dark lines in the spectrum.
