Princeton rates it as
So what do we pursuit in life, money, 'happyness' status, etc. so why do we call it pursuit, ask Chris Gardner in his early life and he would say food and shelter. Pursuit of something which one doesnt have is what makes it a pursuit. But what about pursuit of something impossible! Impossible?
Princeton defines it as
So is 'Impossible' really impossible? or is just something which is not achievable at this point of time? the key is 'time' If men in 18th century was asked we would go to moon in 20th century, his answer would have been impossible. If you would ask Chris Gardner or Bill Gates they would be billionaires, their answer would probably be impossible. So what phenomenon is it that makes the impossible..possible.
It is the pursuit of impossible that makes the impossible, possible. Men and women have strived painstakingly throughout their life to achieve something which was impossible to make it within the realms of possibility.
When something is not achievable, it usually means that things that are needed to achieve that goal are not discovered, those can be new formulations, new materials, new skills, new partners, anything that could achieve that goal. The time frame to achieve that goal is directly dependent to the desire of oneself to achieve it. But we know for onething..when somebody says "it is impossible" remember it is impossible for now and never underestimate humans desire to conquer the impossibility