Try to compare it,
todays development of technology and so on is one impossible thingy to our ancestors few hundred years ago
Imagine what will ppl from hundred years ago think about a computer that can work by using only electric

Human do have limitation, but thats not up to us to decide how much they can do
I believe we wont know our possible potential by measuring

For now we can think human live in the mars is absurd/impossible/nonsense/dreaming/etc, who knows what happen N years later