That still requires a pretty impressive feel for the relative size of oranges and planets though. I would have preferred something like this table: 2 nm Diam

That still requires a pretty impressive feel for the relative size of oranges and planets though. I would have preferred something like this table: 2 nm Diameter of a DNA Alpha helix 4 nm Globular Protein 6 nm microfilaments 7 nm thickness cell membranes 20 nm Ribosome 25 nm Microtubule 30 nm Small virus (Picornaviruses) 30 nm Rhinoviruses 50 nm Nuclear pore 100 nm HIV So 13 nm is on the scale of a very small virus... :)