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Robert Jeffs asked the Naked Scientists:What conceivable force could have dispersed such a vast amount of material against the attraction of gravity. In view of this why have other reasons for the red shift not been sought?
perhaps light waves are attenuated in traversing vast distances and times?
Say you have a gas under pressure, such as the can of spray gas used to clean computer keyboards. As you release the pressure you will notice that the can gets colder and colder. Say we use this can of gas to clean the computer keyboard, in the dark, and have someone watch the can in IR. What they will notice is a red shift, as the can gets colder. We can simulate this with an empty can in motion; Doppler shift. But due to the rapid temperature change, it would need to go really fast.