Demonstration of Acceleration Inside the International Space Station During a Reboost

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Recommends user12102 · 2019-05 · Space Exploration Stack Exchange · on “Could a space colony 1g from the sun work?”

Interesting but no, it wouldn't work for the same reason that astronauts in the International Space Station, other space stations, or orbiting shuttles or capsules do not "feel" gravity with respect to their station or capsule. When you are inside an object which is in orbit, you are in orbit too! The Earth pulls on the station with nearly 1 g and it pulls on you the same amount, but you are both orbiting so you move in the same circles. This gives you the experience of weightlessness within the object, be it an asteroid, shuttle, capsule, or space station. Watch ISS Expedition 22 Commander Jeffry Williams [LINK] in the video Demonstration of Acceleration Inside the International Space Stati

Cites Russell Borogove · 2015-09 · Space Exploration Stack Exchange · on “When the ISS accelerates, do the astronauts feel it?”

If you watch these videos: ATV boost [LINK] Zvezda boost [this video] ...you can see that the acceleration is quite gentle, but definite. The astronauts do need to hang on to something if they don't want to drift to the back of whatever room they're in. The first video was a reboost performed with the ATV [LINK] service ship, as described in this article [LINK] . Depending on what numbers you look at, acceleration during an ATV boost is something like 0.0035-0.005 m/s 2 -- about 1/3000 or 1/2000 of a g. So an ounce or two of force (~30 grams-g-force, or 300 N) is enough to keep an astronaut in place -- easily done with a pinky finger. You can see in the first video that the astronauts can throw t

Cites BruceWayne · 2019-05 · Space Exploration Stack Exchange · on “Are mechanical pencils used on the ISS?”

I have read through this question ("Is it possible to use mechanical pencil instead of space pen in ISS?") [LINK] and it seems that without specially made pencils, it's unlikely as there are better options. (One answer mentions they were used at one time, but have been phased out). However, at about 02:19 into the video Demonstration of Acceleration Inside the International Space Station During a Reboost [this video] , it appears that there are many mechanical pencils on the left: [LINK] Are those mechanical pencils, or something else? That wall looks like writing utensils and they very much look like them!

Cites user12102 · 2019-05 · Space Exploration Stack Exchange · on “Can the ISS boost maneuver engine be heard by the astronauts on board?”

In the extremely cool demonstration video Demonstration of Acceleration Inside the International Space Station During a Reboost [this video] ISS Expedition 22 Commander Jeffry Williams [LINK] says near the end at 04:48 that he could hear that the boost burn was complete. I am not sure which engine was used for these burns in 2010, but how does it manage to make enough noise throughout the ISS to be heard over the drone of the ventilation system and all of the other equipment? I here a faint "ping-pong" (sounds like the 7-11 automatic doors where I live) just before Williams speaks, but I'm assuming that's a video camera being turned off. video cued at 04:48

Cites user12102 · 2019-10 · Space Exploration Stack Exchange · on “Forces experienced during transfer orbit”

During the impulse, I imagine the astronauts would feel the forces of acceleration (just like a car accelerating), but that only lasts for a small time. What happens to the feeling of weightlessness during this time? They don't have a feeling of weightlessness during this time. When the ship accelerates during a propulsive maneuver they would drift to the "bottom" of the spacecraft where the engine is located and then experience a small force. If they land feet first, it will feel like they are standing on an extremely low gravity body. If they are seated, they'll feel like they are sitting on one. When the burn ends, they will regain their sensation of weightlessness. You can see what a ver

Cites user12102 · 2021-04 · Space Exploration Stack Exchange · on “Do standard procedures for securing the ISS before an orbital boost burn include making sure that at least large objects are securely "strapped down"?”

In discussions on previous posts it was debated whether ISS crew would need to "batten down the hatches" and confirm all objects were "lashed to the deck" before an orbital boost burn. My thinking is that for the heavier objects the force necessary to restrain against the continuous air circulation (a mere breeze) would be much less than the force necessary to restrain against a 0.02 g acceleration This is clearly seen in the two videos below, where as soon as the engines start, a several kg camera+lens and say a 65 kg astronaut immediately start accelerating towards the back of the bus station. After 01:36 in the 2nd video there Demonstration of Acceleration Inside the International Space S

Cites user12102 · 2021-04 · Space Exploration Stack Exchange · on “What do ISS astronauts do while the ISS gets reboosted?”

[LINK] above: holding on. below: letting go, and immediately accelerating towards the back of the station. [LINK] [LINK] I’m going to let go now and here I go drifting back toward you again so the acceleration applies to me to. tl;dr They would have to hold on with a force of about 1.3 Newtons to keep in place. Background They strap everything down first (it was suggested that good station hygiene means everything is probably already strapped down, so there should be no separate effort to "batten down the hatches" and confirm all objects were "lashed to the deck" before they say " Let's light this candle! [LINK] " and begin a period of ~0.002 g acceleration, a significant departure from norm