This PDF includes materials for a self-made star/space theme word wall. You can either choose to print just the letters and sticky tack them to a wall or white board, or you can print each individual letter page to hang up in your class room. I recommend laminating the letters or the individual pages, so they last for at least a year or two.
I have several other space/star theme materials available. Please visit my store at http://www.teacherspayteachers.com/Store/Heather-Meinen-Designs.