Can I die from a fire Extinguisher?
sounds like the tire is loose have it towed to a shop have it checked i'v seen tires come off it ai'nt pretty.
larry is quite right, that analogy uses gravity to explain itself, but i think that that is how a mass can be determined, in the sense that more the distortion of the space, more is the mass and the gravity itself. I think that space is like a 3d interconnecting elastic rubber sheet, and as it is distorted, it doesn't allow things to go away from each other because its elasticity pulls it back together. this is like stretching a rubber band, and then it goes back to its original shape. now to answer your question, it doesn't really have to be a perfect circle, it can be an oval aswell. I think that the curvature the sun creates would be a perfect circle as the sun itself is a perfect sphere but the orbit of the planets doesn't nessesarily have to be a perfect circle. Lets use the rubber sheet theory to explain this, if you roll a ball representing a planet improperly around another heavier ball representing the sun, that ball which is representing a planet would move like a perfect oval.