NASA Astronauts Eat Space-Grown Food • Hacker News Board

Re: NASA Astronauts Eat Space-Grown Food

#11

Post by pjc50 » Tue, Aug 11, 2015, 11:36 AM UTC

verytrivial wrote: post #3

This is an interesting from a protocol point of view, but I would like to see something more useful than leaf vegetable -- I imagine months of whatever nutrients this lettuce provides could be supplied by a handful of pills. What about actually calories? I guess with leaf you eat the whole thing , but ... it just feels a bit .. gimicky.

Presumably it was chosen for ease of growing. If you can grow lettuce, you can move onto growing rice/potatoes/corn for calories, although all of those have larger space/water requirements and maybe stalk issues in microgravity.(+)

It's rewarding to the astronauts to be able to eat fresh homegrown food rather than years of mush and pills on the proposed Mars trip.

I also suspect that, as on earth, it's easier to pack calories into your diet (especially sugar) than a full range of nutrients, some of which decay in air or storage.

(+) One of the great advantages of hybrid wheat was solving the problem that bigger ears of wheat snapped off the stalk. In microgravity this would no longer be a problem ..

Re: NASA Astronauts Eat Space-Grown Food

#12

Post by Symmetry » Tue, Aug 11, 2015, 1:09 PM UTC

RLN wrote: post #4

XorNot wrote: post #2

I wonder what the expense of scaling this would be. Could you blow up a large inflatable greenhouse on the side of the station, for example, to get more growing area. Could you scale to reduce oxygen-demand this way?

My first thought in the case of an inflatable greenhouse is that any small piece of debris is going to go straight through it. Not really a very knowledgeable area for me though.

Inflatable habitats are certainly a thing[1] and there'll be one attached to the side of the ISS soon[2]. However you need a bunch of layers of touch material to make a spaceworthy container that won't get punctured by a meteorite and that means light doesn't get let in so you need to light them. Shifting the spectrum of the light to something that chlorophyll absorbs best might make up for the solar panel to LED inefficiency somewhat.

[1]https://en.wikipedia.org/wiki/Bigelow_Aerospace

[2]https://en.wikipedia.org/wiki/Bigelow_Expandable_Activity_Mo...

Re: NASA Astronauts Eat Space-Grown Food

#13

Post by A_Beer_Clinked » Tue, Aug 11, 2015, 1:42 PM UTC

TeMPOraL wrote: post #5

RLN wrote: post #4

Earlier quoted context omitted.

My first thought in the case of an inflatable greenhouse is that any small piece of debris is going to go straight through it. Not really a very knowledgeable area for me though.

Maybe we could use similar techniques we use for car tires to auto-close holes in them? Like two layers of outer surface and some chemical in between that would react with the air that's rushing out and seal off the hole? I don't know the details about such technologies, but it seems to me that inflatables should be much easier to make self-fixing than hard structures.

In the Ben Bova Mars series they have strategically positioned piles of patches that get sucked up and stuck in the holes. Maybe you could accomplish something similar with a middle layer that was oversized and stuffed in between the outer edges...

Re: NASA Astronauts Eat Space-Grown Food

#14

Post by pvaldes » Tue, Aug 11, 2015, 1:49 PM UTC

A minute of silence for the first spatial member of the plantae kingdom killed so many miles far away from home in such horrible lab accident.

"Ground control to major Tomato"

"Absorb your pellets and put your helmet on..."

We'll miss you so much, little Latisha 'Redleaf' Stemstrong.

Re: NASA Astronauts Eat Space-Grown Food

#15

Post by knodi123 » Tue, Aug 11, 2015, 2:44 PM UTC

pvaldes wrote: post #14

A minute of silence for the first spatial member of the plantae kingdom killed so many miles far away from home in such horrible lab accident. "Ground control to major Tomato" "Ground control to major Tomato" "Absorb your pellets and put your helmet on..." We'll miss you so much, little Latisha 'Redleaf' Stemstrong.

From the aptly named https://en.wikipedia.org/wiki/Plants_in_space

"The first organisms in space were "specially developed strains of seeds" launched to 134 km on July 9, 1946 on a U.S. launched V-2 rocket. These samples were not recovered."