Learn how planets form from dust and gas, from protoplanetary disks to rocky worlds, gas giants, and icy bodies.

Learn how gas giants and ice giants differ in composition, size, atmospheres, and formation, with clear examples from our Solar System.

Discover why planets range from tiny rocky worlds to giant gas and ice giants, and what shaped their sizes.

Learn how planets get rings, what they’re made of, and why some worlds keep spectacular ring systems while others do not.

Build a realistic solar system model at home with simple materials, accurate scale choices, and a clear step-by-step plan.

Explore why the Kuiper Belt matters for understanding planet formation, icy worlds, and the history of the outer Solar System.

See how scientists evaluate solar system mission ideas, from discovery goals and budgets to risk, technology, and planetary protection.

Learn the key differences between asteroids and comets, from composition and orbits to how they behave near the Sun.

Discover why Uranus is the coldest planet in the solar system and how extreme planetary temperatures are measured.