spectrum and spectroscope - Students, Britannica Kids

electromagnetic radiation - Students, Britannica Kids

Rainbow Spectro-Scope - SciencetoyMaker

photoelectric device - Students, Britannica Kids

electromagnetic radiation - Students, Britannica Kids

spectrum and spectroscope - Students, Britannica Kids

Spectroscopy, Definition, Types, & Facts

Spectroscope - Griffith Observatory - Southern California's gateway to the cosmos!

Spectroscopy, Definition, Types, & Facts

photoelectric device - Students, Britannica Kids

Spectroscopy, Definition, Types, & Facts

astronomy - Students, Britannica Kids

William Huggins - Students, Britannica Kids

star - Students, Britannica Kids

telescope - Students, Britannica Kids

National Curriculum Unit: 21.04.08 - Yale National Initiative