Here's another one of those theories: There never was a planet X, instead the object that makes up for the excess mass of our solar system is a brown dwarf. The brown dwarf makes our solar system actually a binary system which would account for the amount of damage done when it's orbit brings it close to our Sun again. I like this theory and really what does it matter which is the corret one 'cos when whatever it is comes back to us we won't have a chance to worry about it. Happy thoughts. Catlin