6 votes

Use of carbon monoxide as propellant on Mars

LOX/CO propulsion systems will have a lower Isp compared to LOX/CH4 based systems. So for an equivalent delta-v (or mission application) this will translate to an increased amount of propellant that ...
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  • 936
6 votes

What would it take to survive the radiation on the surface of Ganymede?

A Couple Feet of Concrete Starting with 5 Rem per day surface radiation quoted on Wikipedia / Carl Witthoft's answer, you can calculated that shielding required for prolonged exposure would be several ...
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5 votes

Pressurized Organic Oxygen Pods

The stoichiometrics of respiration say that the CO2 exhaled by one person, plus their poop, can be converted by algae into 3000 calories of nutrition and 26 moles of oxygen (enough for a day) using ...
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  • 6,758
5 votes

Is 1/6 G enough for humans to stay healthy?

We don't have enough medical data to decide if 0.1667 g is enough or too few. To get enough data we would need hundreds of humans living at 0.1667 g for some decades. But from what we know now it ...
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4 votes

Mars versus the poles of Mercury WRT colonization

There are several arguments which favour Mars over Mercury as a candidate for human missions. Getting there and coming home As the question and other answers have highlighted, the delta-v for ...
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  • 936
4 votes

What is the planned Nuwa city atmosphere?

According to the Nuwa Concept Technical Report, the habitat atmosphere will be 30% oxygen by volume at 75kPa (~11 psi), with the balance being nitrogen, argon, and CO2. Agricultural modules will be ...
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2 votes

How does increased environmental radiation affect medication potency, long and short term?

There is an excellent article on the topic in Nature: https://www.nature.com/articles/s41526-019-0076-1 So far, the issue of medication shelflife has been dealt with by re-supply, so the study of ...
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  • 6,758
2 votes
Accepted

Can VLF be used to create a Mars barrier?

Can VLF be used to create a Mars barrier? The short answer is no because Mars does not have an intrinsic magnetic field, thus no uniform dipole magnetic field to generate a magnetosphere. I wrote an ...
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1 vote

Are there any considerations to build up would-be colonial newborns' immune systems when space outposts are designed to be as sterile as possible?

Nothing is sterile around Humans. Humans are messy. Always! And the Hygiene Hypothesis is quite weakly supported by the data available. What IS supported by data is that microgravity is negatively ...
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  • 1,595
1 vote
Accepted

Are valleys a good alternative to caves for radiation shielding?

Valleys share many of the access and safety issues and geographic limitations of caves. Unless you're very lucky to find the perfect lava tube/valley right next to a good landing site, you will ...
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