If Sedna has such a crazy elliptical and lengthy orbit, what exactly ties it to our solar system? Gravity, OK, but is it just the Sun or all the planets combined that have the ability to pull the wee one back from its farthest point? It just doesn't seem feasible that once it gets to the great length of its orbit that the gravity posessed by our SS would have the strength to pull it back. Is it not considered a comet because of its size, composition, or frequency? What keeps comets together when they have such velocity and are making "a turn" to head back towards the sun? If Sedna is roughly the size of Pluto, could it be another "Pluto" in the making? Will Pluto's orbit ever be more planar(?) like Earths and the rest of the planets?