More to explore:
Really good site from kids science museum - games take some prep but are educational and well-designed
10 Solar System and Space Themed Activities For Kids (C2, W9) (see name rocket craft)
Planet Project, great visual representation of the planets' distances
solar system diorama idea
ScienceCasts are short videos about fun, interesting, and unusual science topics and discoveries about Earth, the solar system, and beyond.
DIY Solar System Snow Globe. It combines so many elements. love… Polymer clay, creativity, glitter, and science.
Constellation Book list up with a flameless candle - great extension for solar system study
Fairy Tale STEM activity - Jack and the Parachute freebie
Order of Planets Poster with Printable Planets
solar system ideas
Planets Cutouts - can do a "Pin the Sun at the Center of the Solar System" game