Scientists will then shine various wavelengths of light through the chamber to measure the spectrum of whatever is inside. (scientificamerican.com)
The spectrum showed how much energy the star emits at various wavelengths, each of which corresponds to a temperature. (discovermagazine.com)
Many cover only specific parts of the electromagnetic spectrum, and astronomical objects and phenomena usually need to be observed at various wavelengths, requiring a wide variety of instruments. (sciencediplomacy.org)