Professor notes: You can find the hydrogen emission spectrum in Figure 6.13 here: https://openstax.org/books/chemistry-2e/pages/6-1-electromagnetic-energy (Links to an external site.) Would you like to learn more about Fraunhofer lines? Check out the following resources as a starting point: http://www.columbia.edu/~vjd1/Solar%20Spectrum%20Ex.html (Links to an external site.)https://apod.nasa.gov/apod/ap100627.html (Links to an external site.)http://prc.nao.ac.jp/extra/uos/en/no05/ (Links to an external site.)https://www.universetoday.com/53563/who-discovered-helium/