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this post was submitted on 01 Nov 2023
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Astronomy
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An important addition to that may explain why: The lunar night approached -150° C and the experiment failed to keep the steady 24° C that it was supposed to maintain, so the plants died. I don't think it was because growing plants on the moon is intrinsically impossible.
I also wonder how they expected 18 mL of water to last more than a few days anyway. Perhaps someone smarter than me can answer that.
In any enclosed system the water circulates through the plant, evaporates into the air, possibly condenses on surfaces, then is drawn back into the plants again. There is no need to add water as long as there is enough tongo through the cycle.
This was basically a heated terrarium that did not stay warm enough.
2 week long nights will kill any plant, at least down to the roots. 2 week long days will kill most. Can't garden on moon. Not without grow lights. Maintaining temperature isn't enough.
The entire farm was about the size of an ice cube tray, and had a growing volume of about 2 cups. Terrariums in general would use about 6 tsps for a 2-cup terrarium; the Chinese experiment used about 3.5 tsps. I'm not sure why they used that amount of water; I would speculate (and it's only speculation) that the plants they choose didn't need more, or possibly the lower gravity on the moon meant that the water was generally more accessible to the plants.
Plants grow mostly by sucking water into their cells, so the water should soon end up stuck in the plants if everything else went right. I suppose they did count with it, but 18 ml of water is still suprizingly little.