I think the big thing is that all those original achievement don't defy physics to achieve them. It was a case of ignorance and the belief that we just were not that smart. And while there was a big period of exponential growth - there is an upper limit.
We aren't going to Galaxies in a few hundred years - the time to Andromeda is 2.5 Million Light Years. Unless we fundamentally have physics wrong, we aren't doing that any quicker no matter how hard we try.
We aren't going to Galaxies in a few hundred years - the time to Andromeda is 2.5 Million Light Years. Unless we fundamentally have physics wrong, we aren't doing that any quicker no matter how hard we try.