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@GremlinWrangler talked about the approach aspect, but I'm going to mention the docking aspect. Docking is fundamentally a controlled, low-speed collision between two large pieces of hardware (ISS comes in at around 1M pounds, or around 450,000 kg). The soft capture system of the docking mechanism has to serve as alignment, capture, and shock absorber for ...


5

Several political and practical factors are in play. The first is that the ISS is a multinational construction, so whole of craft risks from a high speed docking need to be signed off on by all parties, including those who are using other types of craft to deliver supplies (and therefore have no benefit from the risks being taken). It is perfectly possible ...


2

I have not found a reason explicitly stated so some deductive reasoning was used When the unpiloted Soyuz MS-14 tried to dock to Poisk in August 2019 it failed with an automated abort. Analysis pointed to "a faulty amplifier in the Poisk module’s passive KURS system". To get MS-14 docked, the crew of Soyuz MS-13 boarded it, undocked it from the ...


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