Given a manipulative interaction (drag-to-stack, drag-to-fill, mass-balance, comparison-tap), the learner produces and recognizes the scale facts of the Sun: ~100x Earth diameter, ~1,000,000x Earth volume, ~300,000x Earth mass. Through comparison item 4, the learner accepts that the Sun is AVERAGE among stars (not the biggest, not the smallest) — directly breaking M12 (Sun is biggest).