According to what i've read, the andromeda galaxy is approaching the milky way galaxy. Also, i've just recently discovered (on the net) that andromeda has a much larger subtended angle than the moon or sun. Hence, as it approaches it's angle subtended will keep increasing. I've also known that the andromeda can be seen as a fuzzy something in the night's sky at a remote place at sea level to the naked eye., but i don't think its as large as the moon. So, my question is (could not put the full question in the heading): How many years in the future will the present "naked eye" of a human be able to see a fuzzy silhouette of the andromeda galaxy as big as the moon? I can only see 2 factors to be considered, the increasing angle subtended of the andromeda galaxy and the decrease of the distance light has to travel, but i do not know the math. The state of earth's atmosphere in the future cannot be determined, i guess, so you can use its present state.