4 ms·

If you're in such serious condition that the moon base doctor can't repair it on the moon, then you're probably not going to survive liftoff from the moon, 3 da

If you're in such serious condition that the moon base doctor can't repair it on the moon, then you're probably not going to survive liftoff from the moon, 3 days in transit with whatever life support can be provided by your fellow astronauts, and then withstand landing and final transport to a hospital.

ClumsyPilot 4y ago
> such serious condition that the moon base doctor can't repair it on the moon Imagine you are one of the first 100 people on the moon, how many doctors will they have, 1? 2? How much medical equipment will they have, how large does the base get before they ha e an x-ray? Will they even have a dentist? Are they going to have an MRI to find out why you have persitent pain in the chest? Are they even going to have a surgical theater? They definately won't be able to do a liver transplant. But they might not even be able to do something basic like fix a broken jaw and a root canal.
erikpukinskis 4y ago
Moon liftoff is relatively gentle… the Apollo lunar module didn’t have seats… the astronauts stood during landing and ascent. It experienced like a half a G.
- midoridensha 4y ago
  Yes, Moon gravity is very low. If you can't handle liftoff from the Moon, you can't handle a helicopter ride either.
  - samatman 4y ago
    Not only that, a Lunar space elevator to L1 can be fabricated from Kevlar. Now, you do need 50,000 km of Kevlar, and that sounds like a lot until I tell you that there are 1.2 million km of submarine cable right now. We got this one.
    - Johnny555 4y ago
      It's not so much the amount of material that seems daunting, it's getting it to lunar orbit. If my calculations are right, 50,000km of 5cm kevlar cable (which probably isn't nearly thick enough near the top) would weigh over 500,000 metric tons. Which would take around 25,000 Falcon Heavy launches to get to the moon I hope it can be manufactured on the moon or on an asteroid or something.
      - skykooler 4y ago
        Unfortunately, Kevlar is a carbon-based polymer, and carbon is in short supply on the Moon.
        midoridensha 4y ago
        Perhaps the carbon could be flown to the Moon from Earth, and combined there with the available oxygen and hydrogen to manufacture kevlar. (Not sure about nitrogen; is that available on the Moon?)
        skykooler 4y ago
        There's a small amount that gets embedded by the solar wind, but not enough to be extracted practically.
      - nyokodo 4y ago
        > 500,000 metric tons. Which would take around 25,000 Falcon Heavy launches to get to the moon Starship can apparently take 100t to the moon which would be 5000 launches. Elon math has cost per launch eventually reaching $2m which would mean $10b to get the cables to the moon. If terminally optimistic Elon math is roughly correct that puts the project into merely unlikely territory rather than impossible.
        Teever 4y ago
        even if Elon math is off by a factor of ten thats still $100 billion which IIRC is less than the cost of the ISS without even accounting for inflation.
- doctor_eval 4y ago
  It's not the liftoff you have to worry about, it's the landing. Apollo 11 had more than 6G during reentry. https://history.nasa.gov/afj/ap11fj/27day9-entry.html https://history.nasa.gov/afj/ap11fj/27day9-entry.html
BurningFrog 4y ago
I don't think G-force sensitivity and difficulty of operation are especially correlated.

ClumsyPilot 4y ago

> such serious condition that the moon base doctor can't repair it on the moon Imagine you are one of the first 100 people on the moon, how many doctors will they have, 1? 2? How much medical equipment will they have, how large does the base get before they ha e an x-ray? Will they even have a dentist? Are they going to have an MRI to find out why you have persitent pain in the chest? Are they even going to have a surgical theater? They definately won't be able to do a liver transplant. But they might not even be able to do something basic like fix a broken jaw and a root canal.

erikpukinskis 4y ago

Moon liftoff is relatively gentle… the Apollo lunar module didn’t have seats… the astronauts stood during landing and ascent. It experienced like a half a G.

midoridensha 4y ago
Yes, Moon gravity is very low. If you can't handle liftoff from the Moon, you can't handle a helicopter ride either.
- samatman 4y ago
  Not only that, a Lunar space elevator to L1 can be fabricated from Kevlar. Now, you do need 50,000 km of Kevlar, and that sounds like a lot until I tell you that there are 1.2 million km of submarine cable right now. We got this one.
  - Johnny555 4y ago
    It's not so much the amount of material that seems daunting, it's getting it to lunar orbit. If my calculations are right, 50,000km of 5cm kevlar cable (which probably isn't nearly thick enough near the top) would weigh over 500,000 metric tons. Which would take around 25,000 Falcon Heavy launches to get to the moon I hope it can be manufactured on the moon or on an asteroid or something.
    - skykooler 4y ago
      Unfortunately, Kevlar is a carbon-based polymer, and carbon is in short supply on the Moon.
      - midoridensha 4y ago
        Perhaps the carbon could be flown to the Moon from Earth, and combined there with the available oxygen and hydrogen to manufacture kevlar. (Not sure about nitrogen; is that available on the Moon?)
        skykooler 4y ago
        There's a small amount that gets embedded by the solar wind, but not enough to be extracted practically.
    - nyokodo 4y ago
      > 500,000 metric tons. Which would take around 25,000 Falcon Heavy launches to get to the moon Starship can apparently take 100t to the moon which would be 5000 launches. Elon math has cost per launch eventually reaching $2m which would mean $10b to get the cables to the moon. If terminally optimistic Elon math is roughly correct that puts the project into merely unlikely territory rather than impossible.
      - Teever 4y ago
        even if Elon math is off by a factor of ten thats still $100 billion which IIRC is less than the cost of the ISS without even accounting for inflation.
doctor_eval 4y ago
It's not the liftoff you have to worry about, it's the landing. Apollo 11 had more than 6G during reentry. https://history.nasa.gov/afj/ap11fj/27day9-entry.html https://history.nasa.gov/afj/ap11fj/27day9-entry.html

BurningFrog 4y ago

I don't think G-force sensitivity and difficulty of operation are especially correlated.