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# Chapter 20 footnotes


1. There is not agreement between predictions and observations of Lithium abundance, something known as the "Lithium problem."

2. This may look strange, but it's generally true. Remember that in the non-relativistic limit $$E = mc^2 + p^2/2m \simeq mc^2$$.

This page titled Chapter 20 footnotes is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Lloyd Knox.