Timeline for Do astronauts develop the ability to regularly place an object at rest inside the ISS after extended periods in microgravity?
Current License: CC BY-SA 4.0
23 events
| when toggle format | what | by | license | comment | |
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| Jan 29, 2020 at 3:15 | comment | added | Fabian Röling | There is a joke video made by NASA that implies they would try to leave things in mid-air. | |
| Jan 28, 2020 at 13:32 | vote | accept | Bob516 | ||
| S Jan 28, 2020 at 13:31 | history | bounty ended | Bob516 | ||
| S Jan 28, 2020 at 13:31 | history | notice removed | Bob516 | ||
| Jan 28, 2020 at 13:05 | answer | added | Sergiy Lenzion | timeline score: 7 | |
| Jan 28, 2020 at 7:19 | comment | added | Erin Anne | This doesn't answer the question, so it's comment, but THAT PARTICULAR TABLE in the Russian Segment of the ISS has tape on it to hold things in place, per Drew Morgan in this "Grand Tour of the International Space Station with Drew and Luca" youtu.be/Snn1k_qEx20?t=375 | |
| Jan 24, 2020 at 6:15 | comment | added | Camille Goudeseune | @Bob516, yes, the fans are strong enough. It may have been Anton Shkaplerov who mentioned the phrase "out for a fly" used for something not velcroed down that has gone missing. | |
| Jan 21, 2020 at 23:40 | comment | added | Sergiy Lenzion | @Bob516 There are at least 4 factors that will move the "stationary" object: 1) difference in radius vector, i.e. distances of the object's and ISS's center of mass to the center of Earth; 2) mutual gravitational pull between the object and ISS if the object's c.g. isn't in exactly same place as the ISS' c.g.; 3) change in ISS trajectory/velocity due to atmospheric drag whilst the object inside doesn't experience the drag; 4) forces due to circulation of air inside the ISS. 1,2,3 should have miniscule effect; 4 would have the largest effect (depends on air flow and shape of the object) | |
| S Jan 21, 2020 at 23:26 | history | bounty started | Bob516 | ||
| S Jan 21, 2020 at 23:26 | history | notice added | Bob516 | Draw attention | |
| Jan 21, 2020 at 17:49 | comment | added | Bob516 | @LorenPechtel Right, of course, nothing is sitting on a surface in microgravity. When you say how fast it moves does that mean no object could be stationary with respect to the station itself? | |
| Jan 21, 2020 at 16:42 | comment | added | Loren Pechtel | @Bob516 There is no such thing as sitting on a surface on the ISS. It's either attached somehow or it's simply next to a surface. If it's not attached the only question is how fast it moves. | |
| Jan 21, 2020 at 16:40 | comment | added | Bob516 | @LorenPechtel. I don't know how powerful the fans are. Would the fans move a piece of fruit sitting on a surface, like in the photo? | |
| Jan 21, 2020 at 16:21 | comment | added | Loren Pechtel | It doesn't seem possible to me--there are fans circulating the air. Even if something were placed perfectly stationary it wouldn't remain there. | |
| Jan 21, 2020 at 1:57 | comment | added | Ilmari Karonen | @Bob516: It's not exactly the same, but in many respects the situations are analogous. The main differences are that floating objects are confined to a two-dimensional plane (unless you can make them exactly neutrally buoyant, which is tricky) and that water is denser and more viscous than air, which does help a bit. And of course surface tension, which creates a meniscus around floating objects and the walls of the container and causes them to attract each other at close range. (Ps. See also space.stackexchange.com/q/38647.) | |
| Jan 21, 2020 at 0:34 | comment | added | Bob516 | @IlmariKaronen. Is this floating object in a basin of water as a comparison to microgravity based on anything empirical? I just wonder if an object floating on water is the same thing as an object in free fall orbiting the earth. Is gravity still effecting the rubber duck in your experiment in a way that is different from being in the ISS? Also, does the water tension of the surface have any other effect on the floating object, resisting movement of the object? I know nothing about water tension. | |
| Jan 20, 2020 at 21:00 | comment | added | Ilmari Karonen | @BMFForMonica: True, which is why I didn't just post that as an answer. However, if the skill is easy to learn (and it does seem to be — I did the water basin experiment, and it only took a few tries to get two cups to float ~5 cm apart for a full minute) then there's no real reason to assume that most people spending any significant time in microgravity would not learn it. | |
| Jan 20, 2020 at 20:56 | comment | added | BMF | @IlmariKaronen I don't think the OP wants to know if it's possible to learn the skill. I think they want to know if any ISS astronauts have done so. | |
| Jan 20, 2020 at 15:52 | comment | added | Ilmari Karonen | It shouldn't be too hard to test it yourself. For a quick and simple version, fill a basin with water and try placing some floating objects (corks, rubber ducks, bottle caps, ping pong balls, etc.) on the surface so that they float at a fixed distance from each other. (Note that if you put them too close to each other, or to the sides of the basin, surface tension will tend to pull them together, so leave a few cm / inches of gap between them.) For a more accurate simulation, get a some helium balloons and carefully tie weights to them to make them neutrally buoyant in air. | |
| Jan 19, 2020 at 12:00 | history | tweeted | twitter.com/StackSpaceExp/status/1218865821625257984 | ||
| Jan 19, 2020 at 1:26 | history | edited | Bob516 | CC BY-SA 4.0 |
edited title
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| Jan 18, 2020 at 22:05 | history | edited | Bob516 | CC BY-SA 4.0 |
I'm not asking if "whether astronauts dedicate some time to learn and master this skill on a regular basis," just is it a skill they develop through trial and error, and repetition
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| Jan 18, 2020 at 19:13 | history | asked | Bob516 | CC BY-SA 4.0 |