Is interstellar space full of 'Oort objects'?

Yes, astronomers think that probably most stars have Oort clouds around them, which extend much of the way to the nearest stars. And they probably also share objects with each other. Some of our own Oort cloud objects may originate around other stars. read more

The WISE survey looking for planets in the Oort cloud ruled out the possibility of ruled out the possibility of a Saturn sized object out to 10,000 times the Earth - Sun distance, and a Jupiter size or larger object out to 26,000 times that distance. read more

Current models of Oort cloud formation predict that more comets are ejected into interstellar space than are retained in the Oort cloud, with estimates varying from 3 to 100 times as many. Other simulations suggest that 90–99% of comets are ejected. read more