Final answer:
All stages of the Nebular Hypothesis are characterized by the presence of a rotating cloud of gas and dust, called a nebula, which collapses to form the solar system and other planetary systems.
Step-by-step explanation:
A common characteristic shared by all stages of the Nebular Hypothesis is the presence of a rotating cloud of gas and dust, called a nebula. According to the Nebular Hypothesis, the solar system and other planetary systems formed from the collapse of this nebula. The collapsing nebula gradually condensed and flattened into a spinning disk, from which planets and other celestial bodies were formed.