👉 "Extraspectral" is a term that refers to the phenomenon of the presence or appearance of spectral lines in the spectrum of an object, particularly in the visible and near-infrared regions. This can occur due to various factors such as the presence of other wavelengths, atmospheric absorption, or changes in temperature. The term "extraspectral" is often used in spectroscopy and astrophysics to indicate that a line observed is not naturally expected from its respective spectral region, but rather arises from an unexpected interaction
