Question

question 15 scientists determine the composition and temperature of stars by sampling matter on the surface of stars. by analyzing the vibrations that stars emit. through magnetic testing. by analyzing the spectra ( patterns) of the light that stars emit.

Explanation:

Stars are too far - away and hot for direct sampling. Spectroscopy is a well - known method in astronomy. Different elements and temperatures produce distinct spectral patterns in starlight. Analyzing starlight spectra reveals composition and temperature. Vibrations and magnetic testing are not primary methods for this.

Answer:

by analyzing the spectra (patterns) of the light that stars emit.