Diagram of light traveling from a heat source, through a cloud, a slit and a prim to show the absorption spectrum.

The absorption spectrum, produced when a transparent and relatively cool gas absorbs part of the light in the continuous spectrum of a hotter source. It appears as a series of black lines superimposed on the continuous spectrum, with the black lines corresponding to the composition of the chemical elements in the cooler gas.

ASTROLab of Mont-Mégantic National Park

© 2006 An original idea and a realization of the ASTROLab of Mont-Mégantic National Park

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