I think most things can be possible given enough time.
My great gran lived with us, she was born in 1890 and died in 1978.
She told me that when she was a girl her uncle told her that the only thing that would fly are bird's and angel's.
The change's she saw in her life were many.
But space is so vast we won't see much headway made for generations.
So far nothing is faster than the speed of light, and if you travelled across our galaxy, the Milky Way at the speed of light, it would take 100,000 year's to get from one side to the other.