Cover walls with black paper (or use rolls of black landscaping plastic) and draw or paint stars and planets on the paper with glow in the dark paint or chalk. Hang plastic glow in the dark stars from the ceiling. Use black and blue streamers and balloons. Decorate the party table with a black table cloth and sprinkle star and/or planet shaped confetti on the table. Cover with a clear plastic table cloth. Fill small vases on the party table with rock candy lollipops and tie with ribbon. Sprinkle starburst candies on the table.