The composition of the heavens was a great mystery until the spectroscopic discoveries of the mid 1800s showed that the chemical elements in stars are the same as those on Earth (as we discussed in Chap. 6).
CITATION STYLE
Perlov, D., & Vilenkin, A. (2017). Dark Matter and Dark Energy. In Cosmology for the Curious (pp. 131–141). Springer International Publishing. https://doi.org/10.1007/978-3-319-57040-2_9
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