Arabic:
English: Farther than earth from heaven.

I put the Arabic letters in an image because I'm not sure this forum can read them.
So anyway this is a Lebanese proverb which is said about something's possibility to happen, so when you say the chances are farther than the distance between the Earth and the Sky, then you're basically out of luck. In other words, you have no chances in doing/succeeding in whatever you're talking about.