Paint each foam ball to represent the Sun and planets, adding simple textures, then let them dry completely.
Arrange the planets on the poster board to plan spacing and orbital paths before gluing.
Glue the planets in place, then add pebbles between Mars and Jupiter to form the asteroid belt.
Draw curved orbit lines and scatter stars across the background using a paint pen.
Write planet names on paper labels and glue them near each object for clear identification.