How Do Astronomers Learn What Elements Are Present in a Given

question 15

Multiple Choice

How do astronomers learn what elements are present in a given star?

• A) look at what color light dominates its continuous spectrum
• B) listen for coded signals in the radio waves it gives off in the FM band
• C) look at the absorption lines in its spectrum
• D) send spacecraft like Voyager to examine its make-up from close-up
• E) compare visible-light photographs of the star (taken with large telescopes) to those of the Sun.

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