Let me think what falls under impossibility…
It is impossible to reverse sequence of the night to come before day.
It is impossible to ensure our actions, although we are sure of our intentions.
It is impossible, to bring dead to life.
It is impossible, to know where we get buried, although we may buy our graves in advance.
It is impossible to make a list of unknown, for the moment we write , it means we know 😉
It is impossible to know where we came from, before arriving on this earth.
It is impossible to capture fragrance .
Possibility is within our capacity and impossibility is what is beyond our range, physically and with thoughts.