Quote:
Originally Posted by janoskiss
Light does not "run out" or change its characteristics as it travels through space. However space is not empty so it will eventually interact with something and lose some or all of its energy in the process.
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Well actually the interaction of light with other matter just means that the light is re-radiated at another wavelength (ie dust absorbs the energy from a photon then re-radiates it at IR with the same amount of energy) or the light is reflected/scattered. It all depends on what you mean by light losing energy....
Cheers