By A Mystery Man Writer
In 1802, William Hyde Wollaston discovered dark lines in Newton
Spectral line shape - Wikipedia
spectra - Supernova remnant spectral lines - Astronomy Stack Exchange
Photonics, Free Full-Text
Student Worksheet: Graphing Spectra
Stream Spectral Lines by Space Cassette
File:Spectral-lines-continuous.svg - Wikipedia
Spectral Lines Stock Illustrations – 4,012 Spectral Lines Stock Illustrations, Vectors & Clipart - Dreamstime
Emission Line
Properties of Stars
Lecture 6: Discrete Spectra of Atoms