The main difference between the nebular and condensation theories is that the condensation theory stresses the importance of interstellar dust to the formation of planets.
Interstellar dust is a significant component of the galaxy. It is produced in many various locations in the universe such as in the cooler outer layers of red giant stars where it is eventually blown off by the solar winds and it can also be produced in the expanding shell of gas residue from a supernova remnant. The central part of the interstellar dust is enclosed by ice and it is made up of either silicates or metals or at times a little of both.