[xelasnave]

Put your thinking caps on make a cuppa and ponder upon this☺

Some background...having a chat on another forum re The Big Bang Theory and how it is clums6y attempt to incorporate the pagan cosmic egg concept into science...for a laugh☺

Anyways it occurred to me our conclusion that the universe is expanding relies upon interptetation of red shift...and there was a time where folk proposed what I will call "tired light" hypothesies where red shift was seen to be caused by some sort of resistence being encountered by light such that energy is reduced and it is those mechanics that produces red shift...those ideas are today seen as near crack pot but in fact were presented as faulsifiable at the time...and this part of the history of cosmology is , as all of it is, most interesting.

So lets assume only for the purpose of a discussion here that we are faced with two competing propositions ..tired light static universe or red shift due to cosmic expansion...how can we tell if the universe is expanding by other observations.
Well I have it.
We observe a gallaxy at the very edge of the observable universe at a point where it will cross over to that part of the universe we can only call the unobservable universe.
Would this be possible is the question.
Not in a humans life time comes to mind so what would be the velocity at the edge of the observable universe...how long would it take a gallaxy to finally disappear.
Further can we observe to the edge of the observable universe ....
Alex