How and why are planets spherical? What makes them round?
Why are planets mostly round?
What's the point of existence of other planets? Why are clouds round and curved in shape? Why can't they be squares or triangles? Given the trillions of objects orbiting the sun in the Asteroid, Kuiper-Edgeworth and Oort Belts, why haven't more coalesced to form planets? How big would the sun look on other planets? How close can two or more Earth sized planets orbiting a small star come before they adversely affect each others’ orbits? How big is the planet? Is the sun considered a planet? Why or why not? Is there a planet in the universe as big as our Sun? Why earth revolves around sun? What is a planet? How round is the world? Is there a planet bigger than Jupiter? Is it sad that other planets in our solar system look so lifeless? Why isn't the Sun orbiting Earth? Does a planetary orbit depend on the sun? Why doesn't Jupiter orbit the sun? What are the dwarf planets in the solar system? How many planets are there? How did the planets get their names? How is the gravity of other planets measured? Why is the sun big? How big a planet can be? Why can so many people believe, without question, that the Earth is round but not that it might indeed be flat? Why does Uranus not orbit anticlockwise like the rest of the planets? What is the principle behind why celestial objects like planets do not collapse into the gravity of the sun but revolve around it? Why is Pluto no longer considered a planet? Which star has the most planets orbiting it? Is the sun bigger than Jupiter? Why is the Sun so big? What is our planet?