His point is that exactly every single notable achievement in the history of mankind has been preceeded by people saying things just like these - skeptics who k

His point is that exactly every single notable achievement in the history of mankind has been preceeded by people saying things just like these - skeptics who keep saying "it can't be done" up until the very last second before "it" is done. It was said about crossing the seas. It was said about colonizing the surface of the planet. It was said about diving deep into the seas and it was said about taking off ground. It was said about leaving the atmosphere. It was said about reaching out into space. It is currently being said by some about colonizing our solar system, and most people currently feel that the thought of us not colonizing our solar system is ridiculous, and in time the thought of us not leaving this solar system to go on to the next one will be considered just as ridiculous. "Scientists" like these often suffer from the common problem of never being able to see farther than their own nose; they constantly forget that we grow, and grow, and grow. Without meaning to sound pretentious and cheesy, here's a nice quote from a certain sci-fi series that came to mind: "It's our destiny to walk among the stars", and you can be damned sure that we will, providing we won't kill ourselves on the way.