Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.
Q: Steps: (1) A star burns in space (2) Eventually it burns all its hydrogen (3) Becomes a red giant (4) Once the red giant burns itself out (5) The core of the star collapses (6) The gasses will start to disperse (7) A white dwarf has been formed.  
Where does the following step fit into the given list of steps: Only the core is left 
A: 
 After step 6. 