The Science: Astronomy: Amateur: (Spectroscopy Amateur )

Spectroscopy is the technique of obtaining and recording the spectra of light sources. A spectrum is the continuum of colors (as in a rainbow) formed when light is dispersed so that its component wavelengths are arranged in order. Spectroscopy Amateur Astronomy Science.

Spectroscopy / s p ɛ k ˈ t r ɒ s k ə p i / is the study of the interaction between matter and electromagnetic radiation. (wikipedia)