the nebular theory states that the solar systems developing rotations revolve around sun. it is located in the milky-way. revolving around the sun, with gravity pulling it, an interstellar cloud of dust and gas, is formed. (i.e. the nebula that we are speaking)
this formation is a protostar. the idea in the theory states that the nebula has flattened into a disk called the "protoplanetary disk"; and over time, the debreis eventually formed this disk. (i.e. creating the milky-way)
hopefully this helped, thank you!! :D
