I would like to know the real difference between 'upward trajectory' and 'skyrocketing' terms. Skyrocketing behavior looks like a curved path with an exponential growth as illustrated below; http://houstonagentmagazine.com/wp-content/uploads/2012/11/houston-housing-market-home-sales-skyrocket-wayne-stroman-har-houston-real-estate.jpg
and dictionary defines 'trajectory' as :
"the high curving line in which an object such as a missile moves through the air" - MacMillan Dictionary
"the curved path that an object follows after it has been thrown or fired into the air" - Oxford and Cambridge Advanced Learner's Dictionaryhttp://www.air-and-space.com/20060614%20Camino%20Cielo/DSC_7740%20Minuteman%20III%20launch%20l.jpg
Accordingly, it seems 'upward trajectory' does not have an exponential pattern (growth rate increasing every one step at a time) and therefore the curved path reaches an apex and then follows a downward trajectory.
Please distinguish these terms: 'skyrocketing', 'upward trajectory', and 'downward trajectory'.
Sorry If i made wrong assumptions; you may correct me.