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Visible light which makes up only a very thin slice of the whole electrodynmagnetic spectrum (note the wavelength scale in our cartoon is not regular) is a very important part of the electromagnetic spectrum. The unique aspect of visible light is that it is the only part of the electromagnetic spectrum that our unaided eyes can see. Furthermore, our eyes are fairly sensitive to this part of the spectrum as we perceive the longest wavelength of visible light as red and the shortest as violet.
When Sunlight passes thru a piece of cut glass or a prism we see a rainbow of colors, sunlight broken into its component colors for the the visible part of the solar spectrum. The Sun emits at all the wavelengths bands shown in our cartoon, with the visible part of the complete spectrum being only part we can see without the aid of other instruments, such as the instruments onboard the Yohkoh satellite.Since the Sun emits a very wide band of radiation, it is interesting to compare views of the Sun obtained from different spectral bands. When one does this they find that the Sun has many different looks (or faces). Click here to see some of those different views.