Why can't planets be different shapes?
Why are all planets spheres?
What's the point of existence of other planets? Do spheres actually have 8 sides? What is a planet? How many planets are there? How many spherical moons, dwarf planets and terrestrial planets are there in the Solar System? What are natural satellites of a planet? What are the dwarf planets in the solar system? Why are most planet orbits in our solar system on relatively the same 2D plane? Are the orbits of each planets coplanar? How many planets are there in the solar system? What is the difference between inner and outer planets? What is our planet? Why is Pluto no longer considered a planet? How is the gravity of other planets measured? What is Planet X? Is it sad that other planets in our solar system look so lifeless? How many planets are there in the universe? How many planets are currently in our solar system? How many planets are there in our universe? How many planets do we have in our solar system? How is each planet different from each other? What is a sphere? How do sphere helps our daily lives and what are some examples? Why isn't Pluto a planet? 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 many planets are there in the solar system including the dwarf planet? Is the sun considered a planet? Why or why not? Are there satellites orb? Is it possible that moons of planets in our solar system have their own moons ? Is the Moon a planet? Is Pluto a planet?  What are the natural satellites of earth?