Einstein's theory of relativity still stands and will continue to stand.Exactly, we really do have such a lot to yet learn.. The nay sayers, base their opinions on what we know now. I wonder if they would be saying similar, just 50 years ago, to many of the things we take for granted today, which would have seemed miraculous just that half a century ago.
Matter can't travel at light speed. There is not enough energy on the planet to propel a spacecraft at the speeds required to cross vast distances. Nor can lifeforms endure the passage.
