'Astronomical spectrum' is not a specific term. I suspect you are thinking of the emission spectrum of a star, which can tell us a great deal about the composition of the star. Light and other radiations from the object are spread out into constituent wavelengths and dark lines appear across the spectrum at certain specific wavelengths which are characteristic of elements present.
The electromagnetic spectrum
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Julius Scheiner has written: 'A treatise on astronomical spectroscopy' -- subject(s): Accessible book, Astronomical spectroscopy, Astrophysics, Spectra, Spectrum analysis, Stars 'Atlas zu \\' -- subject(s): Astronomical photography 'Die Photographie der Gestirne' -- subject(s): Astronomical photography
Political models are used to describe spectrum.
indeed
Dispersion is the term used to describe light splitting into different colors of the spectrum when it passes through a prism.
Political models are used to describe spectrum.
Frequency or wavelength is used in the spectrum of astronomical objects in order to identify which chemical elements are present in the stars.
You can use spectra to estimate the temperature of the star: astronomical thermometer
Earth is the third planet from the sun. Astronomical Unit is the phrase that is used to describe the distance from the Earth to the sun. An astronomical Unit equals 92,955,807 miles.
It is the set area of radio frequencies on which wireless communication is formed upon.
Perhaps you are after the word band or bandwidth.