>> Now, what kind of a picture you could make with a "light" having a 2 
>> Km wavelength, I have no idea.
> 
> http://universe.chimons.org/contents/Radio.jpg

Well, yes, they have various radio telescopes. But I wonder... these 
images are in colour, but does the colour actually represent different 
wavelengths? Or is it just the intensity of radiation being recieved?

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