What is the solar system? What is the order of the planets in the solar system? Why are all of the planets round? How many planets in the solar system have rings? How did the planets get their names? How do the planets stay in orbit around the sun? Are moons always smaller than planets? What is the highest mountain in the solar system? What is the fastest spinning planet in the solar system? What is the largest moon in the solar system? Which planet has the strongest winds? What is the order of the planets from biggest to smallest? Why do the planets have different colors?