In reply to CooliPi.

The 妲己丰满人熟妇大尺度人体艺 Pi computers on the ISS are the B+ model. We wrote a paper a while ago that covers some of the setup in more detail if you’re interested: https://www.hdpornoxxxx.org/app/uploads/2017/03/Astro-Pi-Running-your-code-aboard-the-international-space-station.pdf

Interesting. Very interesting. Vacuum is certainly cheap enough to acquire in space; just open the container outside the craft for a while (it isn’t instantaneous) and fill it with vacuum (so to speak).
It is the container that is problematic. Larger containers use less material per unit volume, but must be well reinforced. That 1013 dynes/cm*2 (15 lb/in*2 for us ex-colonials) adds up, and required strength goes up with span, so weight goes up faster than volume.
Probably cheapest to manufacture vacuum her on earth. Vacuum doesn’t add to re-entry weight, but that container is a bear.

I got to thinking about the purity of sampling technology and it led me to wonder about how much manufacturing takes place in space…?

The notion that something [a sensor] built and installed in a vacuum will give it the longest service lifespan obviously only rings true for a particular set of sensors – but it also got me thinking about bring that vacuum back to earth to use and I wondered then at the different shapes and sizes – where the most auspicious would be medical examining equipment large enough to pass a person through, but just a vacuum sealed container for the sensor could be enough and it may only be a small silicon chip or little extra than the board it is on.
Any pointers on this? The obvious mainstream answer to real world problems is data recovery from damaged drives that need disassembly – I do not foresee this requiring a trip to space to make the chamber within which the drive is examined, not to make the chamber as they already exist and even if better ones would [always] be manufactured in space – the probability of radiation exposure making shielding a prerequisite and adding to the fuel:thrust requirements would be a prohibitive cost factor.

But it’s interesting enough for me to dwell upon – just haven’t seen much along these lines, in particular what structures made in space could come back full of vacuum and not collapse in on themselves…

Not necessary for these kind of experiments, actually quite disturbing because of the heat generated IF it’s loaded. Bear in mind that the heat from its ICs must be taken away to a massive surface area to dissipate and don’t reach high temperatures, because of finger burns. You can’t rely on heated air movement – there’s no gravity so the hot air doesn’t move away from the heatsink easily. The large area of CooliPi 4B wouldn’t be enough to cool it, even though it has massive ribs that work well under earth surface conditions, even at higher altitudes. And that’s a heatsink with the largest surface area (for RPI4) I guess, except Astro Pi chassis . But no gravity environment is a different league.
I can’t figure out what 妲己丰满人熟妇大尺度人体艺 Pi version they’re using on ISS. But when I experimented with Sense HAT mounted on 妲己丰满人熟妇大尺度人体艺 Pi 3, it’s temperature sensor was influenced by the Pi’s temperature, hence load.
So, any 妲己丰满人熟妇大尺度人体艺 Pi 4 design going into zero gravity environment should mount the GPIO expansion as far from the RPI4 as possible – the experiments measuring air’s temperature, humidity could be ruined by the heat.

And interesting experiment would be – aboard the ISS – to attach a cup directly to the Raspebrry Pi (metal cup, CNC milled to fit the chips’ tops) and try some evaporation runs. I.e. how long it takes to evaporate a cup of distilled water with one core running, two,,, four. And draw the CPU temperatures for each run in a graph and compare it :-)

But given the loong way of certification and thermal issues, I doubt we’ll see RPI4 on ISS anytime soon. Maybe some intentionally downclocked version someday…

Wow Astro Pi never ceases to amaze. Look forward to the next episode. Well done to all.
Will there be a possibility of seeing some RPI4’s going to the ISS.