Subject: Re: Richard Feynman explains why Mars a one way trip
We can't shield against cosmic rays with any currently-existing technology, nor are there any real prospects for developing a material that can do so over the next few decades.


And there it is. “We can’t”.

Except you cut off the most important part of his response:

with any current technology

That leaves the future open to the development of the necessary technology.

Might take 50 years.
Might take 100 years.
Might take 1000 years

Or it might only take 10 years.

Regardless, we’ve got roughly the same amount of time left to develop that technology as has elapsed since a celestial gas cloud coalesced into the orb known as earth.


(Unless we continue to ignore the threats to life here and now, of course)