This PDF includes cards listing 24 different jobs you can have in your classroom. Use these cards to designate jobs to students each week/month. There is also one page of blank cards, so you can add your own. Some of the jobs include Messenger, Supply Manager, Librarian, Gardener, Ambassador and Snack Helper.
I have several other space/star theme materials available. Please visit my store at http://www.teacherspayteachers.com/Store/Heather-Meinen-Designs.