A to Z Challenge – Letter X

This is the only letter of the alphabet for which I couldn’t find a word to fit any of my covers. Not many words start with X. A small dictionary might have only a few entries for it. My Webster’s Collegiate Dictionary has one page dedicated to X (out of 1373 pages). So I used the word EXODUS in a sort-of phonetic tackle in this sci-fi cover.

If you could choose another star system or planet for your next destination, where would you go?