OH BE A FINE GIRL KISS ME
In astronomy, the classification of stars is based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism into a spectrum exhibiting the rainbow of colors interspersed with spectral lines. Most stars are currently classified under the Morgan-Keenan system using the letters O, B, A, F, G, K, and M, a sequence from the hottest to the coolest. The conventional color description takes into account only the peak of the stellar spectrum. However, in actuality stars radiate in all parts of the spectrum, and because all spectral colors combined appear white, the actual apparent colors the human eye would observe are far lighter than the conventional color descriptions would suggest. A common mnemonic for remembering the order of the spectral type letters, is Oh, Be A Fine Girl, Kiss Me.