Comet craft: First, have kids use black construction paper with crayons and draw planets and stars. Cut styrofoam balls in half, cover in foil and glue to paper. Use glitter glue pens (or glue with sprinkled glitter) for the tail of comet.
Constellation Collaboration creativity game from Family Fun - kids work in pairs (or families play together?) to create new constellations. Supplies - star stickers, dark blue or black contruction paper, white pen/pencil/chalk to draw constellation lines