An Astronomer Takes Spectra of Two Stars,A and B

Essay

An astronomer takes spectra of two stars,A and B.She discovers that the continuous part of star A's spectrum peaks at 200 nm,while the continuous part of star B's spectrum peaks at 800 nm.Both stars have dark bands superposed on this continuous spectrum,and the locations of these dark bands are the same in both stars.What do you know about the composition of the stars? Why?