LIST OF EVENTS IN FORMATION OF SOLAR SYSTEM (note: the following statements have been randomized) As the diameter of the nebula was reduced, the rate of spin increased Nebula began as a large irregularly shaped mass of gas in space As the nebula was spinning it became flatter and formed a broad accretion disk The force of gravity prevailed over gas pressure and the nebula collapsed and began to spin Within the nebula the pressure of the gases act outwards to cause it to expand while gravitational forces act to cause the nebula to collapse onto itself