* Spacing: The planets are spread out over vast distances, orbiting the sun in ellipses. You can't just add up their diameters like you would with a line of marbles.
* Dimensions: Diameter only measures across a sphere. If you're asking for the total distance covered by all the planets, you'd need a more complex calculation.
What we *can* do:
* List individual planet diameters: We can list the diameters of each planet, which will give you an idea of their relative sizes.
* Calculate the total circumference: You could calculate the total circumference of all the planets (by adding up their individual circumferences) and give you a sense of the overall "length" of all planets combined.
Do you have a specific calculation in mind? Please let me know, and I can help!