This depends on your perspective. "Far far away" for an ant is a mile. A mile for you may not be that far away.
Too far is more than one partner is prepared to go. When in doubt, or when your emotions, feelings and/or impulses get in the way of everything, it is probably too far.
Between two famous city from each of the country, it is approximately: Miles:465.22Kilometers:748.68
yes
yes there is such things as aliens