It's actually much more simple than all that. You see, size is only relevant as it is compared. If your yellow rocket could make it to outer space and you were to fall off and you found yourself floating, all alone, in the vastness of space, then you, in your entirety would no longer have a size. Your hands, feet and any other parts of your body , that you could see, would appear to be the correct size for the body they were attached to, however all of you would be without size. It is all encapsulated in the variableness of quantum mechanics, which is part of the quantum theory that Einstein also said he considered to be one rung above VooDoo. Is this what we write when we have nothing to say? Gee I love physics and wish I could understand it.