If a solar system were surrounded by a cloud of debris, is it possible for a planet's orbit to intersect it?
The solar system IS surrounded by a cloud of debris,left over from its formation. This debris is called the Oort Cloud,&amp; consists of thousands of comet-like bodies,sometimes described as dirty snowballs. None of the known major planets passes through them,but a few years ago some astronomers seemed certain that  they had detected signs of a 9th major planet much further out than the others. They predicted it was only a matter of time before this planet would be discovered,but so far it hasn't been. If there is indeed such a planet &amp; part of its orbit passes through the Oort Cloud,it would probably sweep a lane through it eventually. The planet would not be a nice place to live,as the likelihood is that it has a temperature close to that of liquid nitrogen,&amp; is frequently struck by comets &amp; other debris.