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> But we have sent probes to other worlds? What is science fiction about this? Probes aren't space travel for humans. > A manned mission to Mars is entirely f

> But we have sent probes to other worlds? What is science fiction about this? Probes aren't space travel for humans. > A manned mission to Mars is entirely feasible with current technology. As no manned missions to Mars have ever proven this conjecture, it is still entirely speculation on your part. > A manned mission to another solar system is going to be very-very difficult, we'd need generational space ship/habitats. Note that difficult is not the same as impossible. No, it is impossible. Humans cannot survive in space that long. Never have, currently can't, and there's no precedent to assume it ever becomes possible. Pure speculation on your part.

mehphp 2y ago
>As no manned missions to Mars have ever proven this conjecture, it is still entirely speculation on your part. But we do have manned missions to other celestial bodies, and we have sent and landed probes on Mars. I'm confused as to how a manned mission to Mars is "entirely speculation". >no precedent to assume it ever becomes possible This isn't a qualifier for what is possible. We knew it was possible to go to the moon before there was precedent. If anything, you calling it impossible is pure speculation. OP is right, difficult is not the same as impossible.
- tgv 2y ago
  Manned, i.e. containing people (men).
  - mehphp 2y ago
    um, yes?
TimTheTinker 2y ago
Agree that interstellar travel is impossible with current tech. But based on what I know, I don't see any reason to believe a manned mission to Mars is impossible with current technology. Do you have specific reasons we can't, or examples of technological gaps?
- JPLeRouzic 2y ago
  - One year in weightlessness will almost disable someone and give him blindness, rapid bone loss, cachexia, cardiovascular problems, and sometimes immune diseases. - One year enduring radiation sickness.
  - TimTheTinker 2y ago
    - artificial gravity through rotation - various strategies to block incoming cosmic rays: https://en.m.wikipedia.org/wiki/Effects_of_ionizing_radiation_in_spaceflight https://en.m.wikipedia.org/wiki/Effects_of_ionizing_radiatio.... In particular, hydrogen-rich plastics.

mehphp 2y ago

>As no manned missions to Mars have ever proven this conjecture, it is still entirely speculation on your part. But we do have manned missions to other celestial bodies, and we have sent and landed probes on Mars. I'm confused as to how a manned mission to Mars is "entirely speculation". >no precedent to assume it ever becomes possible This isn't a qualifier for what is possible. We knew it was possible to go to the moon before there was precedent. If anything, you calling it impossible is pure speculation. OP is right, difficult is not the same as impossible.

tgv 2y ago
Manned, i.e. containing people (men).
- mehphp 2y ago
  um, yes?

TimTheTinker 2y ago

Agree that interstellar travel is impossible with current tech. But based on what I know, I don't see any reason to believe a manned mission to Mars is impossible with current technology. Do you have specific reasons we can't, or examples of technological gaps?

JPLeRouzic 2y ago
- One year in weightlessness will almost disable someone and give him blindness, rapid bone loss, cachexia, cardiovascular problems, and sometimes immune diseases. - One year enduring radiation sickness.
- TimTheTinker 2y ago
  - artificial gravity through rotation - various strategies to block incoming cosmic rays: https://en.m.wikipedia.org/wiki/Effects_of_ionizing_radiation_in_spaceflight https://en.m.wikipedia.org/wiki/Effects_of_ionizing_radiatio.... In particular, hydrogen-rich plastics.