Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 30 - Think and Explain: 41

Answer

Analysis of the emission and absorption lines of starlight shows the same lines that appear in the spectra of earthbound elements.

Work Step by Step

Since the spectra match, and the distribution of spectral lines depends sensitively on the type of atoms in the material, we conclude that atoms throughout the observable universe are composed of the same stuff that we are.
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