<P> Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation , including visible light and radio , which radiates from stars and other hot celestial objects . Spectroscopy can be used to derive many properties of distant stars and galaxies , such as their chemical composition , temperature , density , mass , distance , luminosity , and relative motion using Doppler shift measurements . </P>
<P> Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation , including visible light and radio , which radiates from stars and other hot celestial objects . Spectroscopy can be used to derive many properties of distant stars and galaxies , such as their chemical composition , temperature , density , mass , distance , luminosity , and relative motion using Doppler shift measurements . </P>
what kind of spectrum do we observe from the sun
what kind of spectrum do we observe from the sun
electromagnetic radiation
electromagnetic radiation