Absorption spectrum

An absorption spectrum is a unique pattern of dark lines or gaps in a spectrum of light that reveals which wavelengths of light a substance absorbs when it shines through or reflects off it. When light passes through a gas or liquid, certain wavelengths are absorbed by the atoms or molecules, leaving behind a spectrum that shows these missing colors. This can help scientists identify the chemical composition of stars, gases, or even liquids by matching the absorbed wavelengths to known elements, making it a valuable tool in fields like astrophysics and chemistry.