ILLUSTRATION shows some of the more than 100 known DIBs, or diffuse interstellar absorption bands, superimposed on the light spectrum. The specific substances that create these bands by blocking out various wavelengths of light coming from stars is still not determined, although carbon-based molecules, such as PAHs, are considered to be likely candidates.


Absorption bands

Image: PETER JENNISKENS, SETI


Back to The Raw Materials