Question: what are the steps of nebular theory?
Answer: step one(4) -The solar nebula consisted of. -hydrogen, ... 
step two(2) -A disturbance. ... 
step three(2) -The solar nebula assumed a flat, disk shape. ... 
step four(2) -Inner planets began to form from metallic. ... 
step five(2) -Larger outer planets began forming from fragments.