[Levin]

I believe their space suits are made of a protective material. And the spacecraft 50 to a hundred years on is unlikely to be the one you mentioned, just like today's fighter jets are not like those used in WWII and the ICBM are far more lethal than the atomic bombs.

Using today's abilities to restrict tomorrow's possibilities is not good, bro.

I was responding to your sentence "So, yeah, for nao, we cannot live in Mars. Astronauts had better not go there. At least, don't get out of the spacecraft to plant a flag.". What I was saying that even if the astronault don't go out of the spacecraft to plant the flag NOW, his or her kidneys will still be affected by the galactic radiation as the spacecraft cannot shield him/her from the radiation.

Not talking about the future.