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Ways to make an alien atmosphere breathable, but uncomfortable?

Hot, humid ar feels heavy, but it is actually lighter.Water vapor is not respirable, but it is actually less dense than the air that we know. Hot, humid air feels heavier because it is harder to ...
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0 votes

Ways to make an alien atmosphere breathable, but uncomfortable?

I already upvoted one answer, but you said you wanted this galactic standard atmosphere to have a high oxygen level and that could in itself be the problem. Being so reactive, oxygen is toxic when you ...
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1 vote

Ways to make an alien atmosphere breathable, but uncomfortable?

Overly warm and humid can make things almost unbreathable over a prolonged period. Like if you are in too hot a shower for too long. You do not want to experience that.
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1 vote

For how much and for how long would a "Closed Cycle Nuclear Thermal Rocket Engine" generate thrust for a floating ship?

This would be rather difficult, though not completely impossible. Water is a terrible rocket fuel in the context of rocket fuels. It's relatively high mass and volume make it rather hard to accelerate ...
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4 votes

Ways to make an alien atmosphere breathable, but uncomfortable?

Carbon dioxide. According to some tellings, Earth arose very near the inner limit of the "habitable zone" around the Sun. Earth life sucks up nearly every trace of carbon dioxide available ...
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0 votes

Ways to make an alien atmosphere breathable, but uncomfortable?

Thin atmosphere - just as at high altitudes here on Earth. Simply make the atmosphere the same as here on Earth, at the very top of Everest or a bit higher than that. You can survive but it's a real ...
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1 vote

Ways to make an alien atmosphere breathable, but uncomfortable?

Dust or pollen in the air can make breathing uncomfortable causing frequent sneezing and such. Not enough to die from, but certainly uncomfortable. Some people are more resistant than others, and I ...
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1 vote

Would larger oceans stabilize temperature on a smaller planet with a thinner atmosphere?

Winds reach all parts of land and sea In hot area (land or sea), air heats up, expands, raises up and lets cold air blow from sides. This causes sea breeze, land breeze, winds etc. to regulate ...
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5 votes

Ways to make an alien atmosphere breathable, but uncomfortable?

Simply humidity can make breathing uncomfortable. Humidity can make the air feel heavy. Figuratively, because actually humid air is lighter than dry air. The reason is that water vapor molecules are ...
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0 votes

There is an Arcane Dome around a Continent -- What Happens Next?

Ask gods, not humans When gods are controlling everything and they change whatever, whenever, how can somebody predicts what gods will do next? Rules Let gods make certain rules or laws (of physics, ...
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1 vote

Ways to make an alien atmosphere breathable, but uncomfortable?

Helium rich atmosphere One might say that helium will be easily lost to space from an Earth-like planet, but that takes millions or billions of years. And since the aliens are terraformers, they can ...
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0 votes

Organic tech tree using mycelium as its base?

Have you ever heard of the Yuuzhan Vong from Star Wars? They had an entirely organic tech tree, so maybe take some of their ideas (amphistaffs for weapons and door membranes?). Additionally, it’s your ...
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1 vote

There is an Arcane Dome around a Continent -- What Happens Next?

Your question gives you the answer. The “giant, magical dome” prevents extreme weather, except for when the gods want it to happen.
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13 votes

Ways to make an alien atmosphere breathable, but uncomfortable?

There is a discussion about how much of various gases are necessary for humans to survive in Stephen H. Dole Habitable Planets for Man, 1964. https://www.rand.org/content/dam/rand/pubs/...
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8 votes

Ways to make an alien atmosphere breathable, but uncomfortable?

Ozone. Ozone is formed by the action of UV radiation on oxygen and other atmospheric components. It is a normal and protective component of the upper atmosphere. It is also a normal minor component ...
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11 votes

Ways to make an alien atmosphere breathable, but uncomfortable?

Heavy Air 70% of Earth air is Nitrogen. This is nonreactive and harmless to your lungs. If you only breath Nitrogen you will asphyxiate. But it is not the Nitrogen that kills you. It is the lack of ...
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15 votes

Ways to make an alien atmosphere breathable, but uncomfortable?

Uncomfortable is a matter of tastes and culture, but I guess thiols make a good candidate for making an uncomfortable environment: proximity of rotting eggs, sewers, rotting algae are just few ...
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3 votes

Organic tech tree using mycelium as its base?

Drugs. Maybe Houses Too. The only example that comes to mind is how Penicillin is produced by a fungus. It is believable that other funguses could be genetically modified to produce other useful drugs....
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1 vote

Why would some species from the Homo genus be much more likely to be autistic than Homo sapiens?

Intestinal microbiota It is commonly, but erroneously, said that people are organisms of the species Homo sapiens. In reality, a large body of research has illustrated that a "person" is a ...
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1 vote

For how much and for how long would a "Closed Cycle Nuclear Thermal Rocket Engine" generate thrust for a floating ship?

NERVA TWR was 6 - https://en.m.wikipedia.org/wiki/NERVA That was a working engine we can refer to for some specs. Using water is not viable in the case of yours, clouds do have water, but per cubic ...
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3 votes

Why would some species from the Homo genus be much more likely to be autistic than Homo sapiens?

No specific reason is needed, they are or aren't. To support that, it possible to look at any mammal - they do have brains, and some cognitive abilities. Many of them have problems to communicate with ...
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1 vote

Would 25% less gravity produce dramatic differences in animal morphology?

Here is a frame challenge to the idea that 75 percent of Earth's surface gravity is the minimum possible for a planet that can keep a dense atmosphere for geological eras of time. Part One: the ...
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3 votes

How to place multiple small moons and one large moon in stable orbit around an earthlike planet?

Keep your distance Don't count on resonance I would say, this is a many body system. Keep their orbits apart.. far apart. Chaotic systems rely on statistics. The more these moon orbits are apart in ...
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2 votes

For how much and for how long would a "Closed Cycle Nuclear Thermal Rocket Engine" generate thrust for a floating ship?

Just use propellers We can find out how much water we need to fight gravity by simply dividing gravitational acceleration by the specific impulse. Using your specific impulse of 20 kNs/kg for a closed ...
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7 votes
Accepted

Why would some species from the Homo genus be much more likely to be autistic than Homo sapiens?

They Serve a Critical Function: Culture. The nature of the critical function should probably somehow relate to the common feature that these three races have in common: isolation. All three species ...
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2 votes

Why would some species from the Homo genus be much more likely to be autistic than Homo sapiens?

Evolution All three species are solitary. It makes evolutionary sense they would not have as developed a social structure as real humans. There is no need to be as good at reading faces or judging ...
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0 votes

If all humans of this era suddenly became fast enough to dodge bullets, how would this change the military's choice of weaponry?

If one can outrun bullets, their body would be so strong that they wouldn't need to. As others pointed out, faster bullets could solve this problem. But, there are other weapons that could damage the ...
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4 votes

How would life develop/adapt in an Earth-like planet but with less sunlight?

It would depend on how much less light. Because the major issue is the energy balance. If there is less sunlight this implies less energy. Less energy means lower average temperature. Lower average ...
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2 votes

Would 25% less gravity produce dramatic differences in animal morphology?

Everything weight only 3/4 as much as the same mass would on Earth. Thus, for a given mass that must be supported, and constant material strength, compressive structures can be about 87% small in ...
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3 votes

How would life develop/adapt in an Earth-like planet but with less sunlight?

What your describe pretty much nuclear winter but far longer. Your world is covered an ice and snow. The oceans are frozen over. Plants and animals would die in mass. You would have lower ...
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1 vote

For how much and for how long would a "Closed Cycle Nuclear Thermal Rocket Engine" generate thrust for a floating ship?

Sorry, I can't comment because I only finally made an account. How dead set are you on using a nuclear fission reactor? These have several issues which make them unideal for flight with fair amounts ...
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4 votes
Accepted

For how much and for how long would a "Closed Cycle Nuclear Thermal Rocket Engine" generate thrust for a floating ship?

Not with Modern Reactors Kori Nuclear Power Station, South Korea This guy has a bunch of reactors. The biggest one has output of 1400MW. Construction started in 2009 and they turned it on in 2019. So ...
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5 votes

How would life develop/adapt in an Earth-like planet but with less sunlight?

Fungus is now king Most plant life on earth survives via Photosynthesis. Fungi however do not. They thrive in low-light conditions and dark, wet places. Your twilight world is a place of spores and ...
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1 vote

A mainly barren world with two moons and a shared ring. Is it feasible?

It's possible for a moon to have a ring system, as shown by Rhea, so each moon could theoretically have its own ring system. If they were close enough to have a shared ring system, though, they would ...
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0 votes

Is there any feasible way for Antarctica have hidden oases?

Map by Ohawhewhe on Deviantart. You do not specify Sheet Earth or Ball Earth. This problem is easier to solve for the Sheet Earth. There are no oases in Antarctica. But there is stuff beyond ...
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2 votes

If all humans of this era suddenly became fast enough to dodge bullets, how would this change the military's choice of weaponry?

The simple answer is that somebody would build a better gun. For example, they would switch to a scattershot weapon that put out a wall of fire to large to easily avoid, or they would use a gun with a ...
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26 votes

If all humans of this era suddenly became fast enough to dodge bullets, how would this change the military's choice of weaponry?

It'd change less than you'd think. Bullets aren't the only kind of weapon out there, and there are plenty of weapons designed explicitly to be hard to miss with. Volume-of-fire would be king. Contrary ...
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6 votes

If all humans of this era suddenly became fast enough to dodge bullets, how would this change the military's choice of weaponry?

Chances are the development of laser weapons would be ramped up. Youve got a few years before we figure it out, but once practical man-portable lasers are built, these super soldiers wouldn't be so ...
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16 votes

If all humans of this era suddenly became fast enough to dodge bullets, how would this change the military's choice of weaponry?

Who Needs Guns? A gun is a machine that uses chemical energy to accelerate a projectile to (usually) above the speed of sound. When this projectile hits a target, it transfers that energy to the ...
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0 votes

Would it be possible to rearrange a dragon's flight muscle to somewhat circumvent the square-cube law?

The dragon would have a very shallow and wide profile much like a manta ray but this might fit the question. The up and down strokes of the wings will be very different than anything on earth. If you ...
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10 votes

If all humans of this era suddenly became fast enough to dodge bullets, how would this change the military's choice of weaponry?

They never saw it coming: Just because your people are a lot faster doesn't mean they think faster or sound travels faster. A lot of the same weapons would still be used - they would just go through ...
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1 vote

What's the largest population we could sustain indefinitely on a distant space station?

Zero, at optimistically best 5. Pessimistic answer because: Building a colony/station in space is hard. Building and maintaining a station away from LEO is harder. Building things with minimal ...
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7 votes

If all humans of this era suddenly became fast enough to dodge bullets, how would this change the military's choice of weaponry?

Different guns have different bullet speeds. BB guns are the slowest, comparable to paintball shots. Most guns nowadays however shoot bullets that come out of the barrel faster than sound. If everyone ...
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1 vote

Would a lower gravity planet have deeper oceans and higher continents?

It can do. There are a couple of other variables you may want to consider as well as gravity: temperature and level of volcanic activity. Anything large enough to be classed as a dwarf planet by ...
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1 vote

Under what circumstances would a species with 2 sexes evolve into a species with 1 sex?

The OP asked about "species". Most answers refer to animal species, and the answers contain interesting examples. Plants are also characterized by species, and are also sexually, asexually,...
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1 vote

Would a lower gravity planet have deeper oceans and higher continents?

Looking at Mars, which has lower gravity than Earth, the crust does seem to be more uneven. It's home to both Valles Marineris, the deepest canyon in the solar system, and Olympus Mons, the highest ...
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1 vote

Under what circumstances would a species with 2 sexes evolve into a species with 1 sex?

Have two genetic contributors allows for more genetic variety in a short time. Asexual production produces what are basically clones, identical copies of the single parent. there will be some ...
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1 vote

Under what circumstances would a species with 2 sexes evolve into a species with 1 sex?

They are hermaphrodites They reproduce sexually. A scenario of a meeting of equal and equivalent partners would have each be both male and female, each fathering the child that the other carries. ...
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3 votes

Under what circumstances would a species with 2 sexes evolve into a species with 1 sex?

Extreme Dimorphism Your species has two options for reproduction. Female makes unfertilised eggs. These only contain genetic info from the mother. Perhaps they are her clones. Perhaps she scrambles ...
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6 votes

Under what circumstances would a species with 2 sexes evolve into a species with 1 sex?

There already are: The whiptail lizard family (to name just one) has several groups where only females exist. They do not have sexual reproduction, but instead reproduce by parthenogenesis. Other ...
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