This spectrum of a Geminids meteor (upper center) was captured using a diffraction grating. The vertical lines to the lower left of the meteor differ from the man made city lights. The meteor spectrum color bands are narrow and widely separated into discrete bands. By comparison, spectra of city lights can be seen (lower right). Incandescent lights gradually fade from blue to green to yellow to red. Other city lights, probably mercury vapor, have both discrete bands but parts appear to be continuous from green to yellow to blue.