67
votes
Why did the Chinese send flies and plants to the far side of the moon?
Right now, almost 100% of existing research on growth in gravity fields is basically at 0g (ISS/Mir/Skylab/whatever) or 1g.
There are a lot of questions of what happens at 1/6g or 2/3g? No good ...
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17
votes
Accepted
How many plants would be needed to produce oxygen enough for 20 humans?
This article addresses much the same question. The quick summary is about 300 to 500 typical domestic houseplants per person, with significant caveats, more like 700 to be safe. So 6-14 thousand such ...
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16
votes
Accepted
Using bamboo as space construction material
This is a remarkably interesting exchange. I would like to add a few concerns (as an engineer, I go straight for the problems)...
Full culm bamboo is a remarkably inefficient product to transport and ...
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15
votes
Accepted
How deep a valley or trench would be needed on Mars to provide the same atmospheric pressure as 6 km above sea level on Earth?
Mars' atmosphere scale height is, depending on who you ask, 10.8 to 11.1 km.
Pressure at the bottom of Hellas Planitia: 1.16 kPa
Earth sea level: 101.3 kPa
Earth 6km altitude: ~50 kPa.
So we need ...
- 167k
13
votes
Agriculture on an exoplanet
Ignoring the infrared radiation aspect of your question, what you are describing is a situation not too dissimilar to what exists in many parts of Australia.
The extreme degree of weathering that has ...
- 13k
12
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Accepted
Is there any reason Cyanobacteria or Lichens can't survive on Mars?
We don't really know. A study from 2012 suggests that lichens and cyanobacteria could indeed survive the "obvious" perils of Mars, including radiation, low pressure, and temperatures dropping as low ...
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11
votes
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Can plants thrive without atmospheric nitrogen?
Despite the fact that on Earth, nitrogen is the most abundant element in the atmosphere, plants do not get their nitrogen from the air - it is just too hard to get it. A plant would need to expend ...
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11
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Why did the Chinese send flies and plants to the far side of the moon?
They did it for propaganda or pride mostly. What sprouted quickly died because it froze. They did not have a method to protect the biosphere from the temperature swings. This is what they expected ...
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10
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Removing perchlorate from Mars surface soil
Perchlorate contamination is a problem on Earth. Essentially, there is a series of water treatments and bioremediation, the process of using biological systems to fix the problem.
Here is a detailed ...
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8
votes
Agriculture on an exoplanet
In general space based plants will probably be hydroponics so most likely initial agriculture will be indoors in vertical farms. Possibly using mechanically harvested/processed materials to carefully ...
- 21.4k
8
votes
Removing perchlorate from Mars surface soil
Apart from perchlorate treatment mentioned in @Chris's answer, there are some other methods which could be able to remove the perchlorate from the martian soil:
Rinsing the soil with water. ...
- 1,015
7
votes
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Where is that lunar-grown cotton seed sprout?
The announcement was first made by the vice principle of Chongqing University (the primary designer of the growth module) on the 15th of January and you can find the original article summary from ...
- 276
7
votes
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Growing Mars crops in sunlight vs LEDs
Plants can only use a finite amount of light, and are adapted to growth under less than ideal growing conditions...even on Earth, they experience cloudy days, shade from other plants, etc. Many crop ...
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6
votes
How many plants would be needed to produce oxygen enough for 20 humans?
Plants produce oxygen by photosynthesis, where they convert light and CO2 into sugars which they can use to grow. Luckly for us, the oxygen is a waste stream which we can use.
$${{6\ CO_{2}+6H_{2}O+...
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6
votes
Cubic meters of martian greenhouse required
This research I was involved in may help answer your question. The project outlined below used algae, which is sort of a plant, in a bioreactor. The research was concerned with producing oxygen, not ...
- 17.7k
6
votes
Would it be feasible to use natural light to grow plants on Mars?
Yes. While Mars only receives about half of the light that Earth does, it doesn't have clouds or other similar items to deal with. Assuming you can have a dome that is very clear, you should have ...
- 121k
5
votes
Would it be feasible to use natural light to grow plants on Mars?
Roughly speaking Mars gets between 1/2 and 1/3 the light that Earth gets (depending on time of year) meaning you could probably grow plans that handle full shade on earth pretty well but most crop ...
- 1,196
5
votes
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Agriculture on an exoplanet
There are a lot of specific factors that would be relevant for answering this. Here are a few:
What is the composition of the planet's atmosphere?
Is there any soil/regolith and what is it made of?
...
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4
votes
How could we grow plants on mars?
This question is rather broad so I will give a broad answer.
Plants on Mars will require similar things to plants growing on Earth. All of these things:
Sufficient Light
Appropriate dark periods*
...
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4
votes
Accepted
Can a semipermeable greenhouse be used to extract CO2 from the Martian atmosphere and help provide oxygen to a colony without using a pump?
Osmosis against a total pressure gradient is absolutely a 'thing'. Plants and animals exploit this and active transport to move fluids around and they can definitely create pressure gradients.
...
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3
votes
Accepted
Can a symbiosis be sustained between plants and 1 person on Mars?
You might be interested in Biosphere 2 or other Artificial ecosystems, which attempt to answer this.
While the results were impressive
closure experiments set world records in closed ecological ...
- 237
2
votes
Would it be feasible to use natural light to grow plants on Mars?
In hot sunny climates like Australia vegetables are often grown under shade cloth in the 30-50% range (that is 30-50% of sunlight blocked) - this is actually comparable with the sunlight available on ...
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2
votes
How many plants would be needed to produce oxygen enough for 20 humans?
A mature tree consumes 48 pounds (22 kg) of $CO_2$ per year.[1]
The 22 kg of $CO_2$ is made of $\frac{\text{32 g $O_2$ per 1 mole}}{\text{44 g $CO_2$ per 1 mole}} * \text{22 kg $CO_2$} = \text{16 kg $...
- 21
2
votes
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Mars greenhouse accessibility
The question regarding the lowest pressure required for plant growth was asked on the biology stack exchange The answer given there reports an experiment where vascular plants seemed to be at about ...
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2
votes
Have there been at least continuous periods of plants growing on the ISS?
Summary: There were at least 9 years and 6 months of continuous plant growth on the ISS, so the answer is yes if you accept a +/- 6 month margin of error.
The first plant growth experiment hosted on ...
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2
votes
Would it be feasible to use natural light to grow plants on Mars?
There's some current scientific interest in figuring out photosynthesis in resource-short environments, such as low light.
A recent example is the paper "Photochemistry beyond the red limit in ...
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1
vote
Would it be feasible to use natural light to grow plants on Mars?
The other answers do a great job of talking about what plants could grow in Mars natural light, but it's also worth mentioning that by using something as simple as a lens or a mirror, you could easily ...
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