Do the planets of the solar system orbit on the same plane?
How close are the planets of our solar system to being in the same orbital plane?
How close can two or more Earth sized planets orbiting a small star come before they adversely affect each others’ orbits? Is the planet earth moving close to the sun with every orbit? Would there be life on other planets in our solar system? Is it sad that other planets in our solar system look so lifeless? How many planets are currently in our solar system? Would it be possible for a planet to orbit two stars in a figure eight pattern? Is it possible that there is life in other planets? What effect do the other planets in the solar system have on Earth? How important would be the finding of another planet in our solar system? Would a year on Earth be shorter if our planet was orbiting two suns? Is there a planet X in our solar system? Do we know if there is life on other planets? Why do you think that the inner planets are relatively close together but the outer planets are spaced so widely apart? Is it possible for a star to orbit a planet?  Has it ever been observed? How big would the sun look on other planets? How far away are we from photographing a planet in another solar system? How many planets are there in the solar system? As the sun grows old and changes, what will happen to other planets in our solar system? Will we ever be able to reach a planet outside our solar system? What's the point of existence of other planets? Can we see planets with radio telescopes? How would it look like in our sky if Mars was orbiting our Sun on the exact same orbital track as our Earth but it was about 4 months ahead of us? Is there life beyond Earth in our Solar System? Why are planetary orbits ellipses? Is it possible that every planet in our solar system had life at one time? What is the point of all the other planets? How many planets do we have in our solar system? How is each planet different from each other? Is there life on other planets? Why do all planetary systems orbit stars? Is there possibility of life on other planets?