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[MetalSlimeHunt]

Modern LEDs require an essentially negligible amount of energy.

[origamiscienceguy]

I led with nocturnal vision transhumans because its the least offensive and it would save power on the ship.

Or, you know, you could open a window.

[Putnam]

...in space?

[Reelya]

Night vision has little use in space since there's so much light pollution (it's basically high-noon all the time, everywhere, except behind planets), and if you're too far away from the sun to see, you're going to need to heat the ship anyway, so you might as well emit some of that heating energy in the form of visible light.

Human photosynthesis however is very a promising way to reduce ship complexity. You'd save on food, oxygen, CO2 reprocessing etc. Imagine being able to persist pretty much indefinitely in an escape pod, with just sunlight and water filtration.

[origamiscienceguy]

Night vision has little use in space since there's so much light pollution, and if you're too far away from the sun to see, you're going to need to heat the ship anyway, so you might as well emit some of that heating energy in the form of visible light.

Human photosynthesis however is very a promising way to reduce ship complexity. You'd save on food, oxygen, CO2 reprocessing etc. Imagine being able to persist pretty much indefinitely in an escape pod, with just sunlight and water filtration.

water would eventually run out. Waste would accumulate. Can't survive indefinately.

[Arcvasti]

Night vision has little use in space since there's so much light pollution, and if you're too far away from the sun to see, you're going to need to heat the ship anyway, so you might as well emit some of that heating energy in the form of visible light.

Human photosynthesis however is very a promising way to reduce ship complexity. You'd save on food, oxygen, CO2 reprocessing etc. Imagine being able to persist pretty much indefinitely in an escape pod, with just sunlight and water filtration.

water would eventually run out. Waste would accumulate. Can't survive indefinately.

There's a difference between "indefinitely" and "pretty much indefinitely". The former is literally forever and the latter is figuratively forever.

[Reelya]

First up, conservation of mass is a thing. If you don't have a leak then the water would in fact last forever. By filtering it from the air and any waste. If molecules are in fact slipping out of your space pod, I think you'd have an air depressurization problem long before you had a water shortage problem.

Second, if you could photosynthesize then you won't really be eating anything to poop out. If you're not eating anything, then there's nothing to poop.

Probably the biggest thing you'd need to worry about is retaining salt, so you'd need a system to reclaim salt from your own urine.

[origamiscienceguy]

Unless your spaceship is leaking air then the water can't go anywhere. So saying it "runs out" implies conservation of mass broke down, or a leak. But you'd find your pod's air depressurized long before that happened, if you assume a leak.

Humans would still produce waste (poop) which would hopefully leave the ship. That mass has to come from somewhere.

[That Wolf]

Hibernation, hyper muscle density, chameleon skin?

We could perhaps even change our blood comp so it doesnt boil in space, maybe a few more upgrades so a tear in your spidergoat suit isnt the end all

[Reelya]

Unless your spaceship is leaking air then the water can't go anywhere. So saying it "runs out" implies conservation of mass broke down, or a leak. But you'd find your pod's air depressurized long before that happened, if you assume a leak.

Humans would still produce waste (poop) which would hopefully leave the ship. That mass has to come from somewhere.

How much would you poop if you weren't eating anything? e.g. you get energy from photosynthesis?

Just as poop must go somewhere, it also must come from somewhere.

[origamiscienceguy]

Unless your spaceship is leaking air then the water can't go anywhere. So saying it "runs out" implies conservation of mass broke down, or a leak. But you'd find your pod's air depressurized long before that happened, if you assume a leak.

Humans would still produce waste (poop) which would hopefully leave the ship. That mass has to come from somewhere.

How much would you poop if you weren't eating anything? e.g. you get energy from photosynthesis?

Just as poop must go somewhere, it also must come from somewhere.

That's my point. If a human could photosynthasize and metabolize, then they would produce waste, which would require some material to sustain them. Which means it wouldn't be indefinite.

[Reelya]

The material comes from CO2 and water. You can make sugars + oxygen with just that. They are then burnt inside the body by combining with oxygen. There is no need to excrete the resultant materials, you get back CO2 and water.

[origamiscienceguy]

The material comes from CO2 and oxygen and water. You can make sugars with just that. They are then burnt inside the body. There is no need to excrete the resultant materials, you get back CO2 and water.

Plants also need nutrients from the soil.

[Reelya]

All the molecules that you had at the start are still in the ship. You can drink your own pee to get almost everything back.

[Putnam]

You'd probably need to process it some i think?