Absorption lines produced when starlight travels through the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because a. the lines are blueshifted. b. the lines are redshifted. c. the lines are extremely broad. d. the lines are extremely narrow. e. the lines are much darker than the stellar lines.
Absorption lines produced when starlight travels through the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because a. the lines are blueshifted. b. the lines are redshifted. c. the lines are extremely broad. d. the lines are extremely narrow. e. the lines are much darker than the stellar lines.
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Absorption lines produced when starlight travels through the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because
a. the lines are blueshifted.b. the lines are redshifted.c. the lines are extremely broad.d. the lines are extremely narrow.e. the lines are much darker than the stellar lines.
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