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For the purposes of this question, assume Russia's Multipurpose Laboratory Module (MLM/Nauka) gets launched and makes it to the ISS.

Most articles I read say the MLM will dock at the FGB's nadir port (for example, the confusingly written Wikipedia page) At first writing of this question, I thought the DC-1 had been discarded as planned. No, it hasn't. I find the whole situation very difficult to sort out.)

AFAIK the Mini-Research Module 1 (MRM-1/Rassvet) is currently docked at the FGB nadir port. This NASA rendering from August 2019 shows it there (green arrow added by me).

enter image description here

What is the plan for MRM assuming the MLM is to replace it at the FGB nadir port?

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    $\begingroup$ I've added some links/names for the benefit of readers like me with limited space-word vocabulary. $\endgroup$ – uhoh Aug 31 at 15:14
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The MLM is replacing the DC-1 docking compartment (Pirs). Not Rassvet. It is docking to Zvezda not Zarya.

Russian Space Web has an excellent article on the history of the MLM/Nauka/FGB-II module. This detail is included when it says:

Prior to the MLM launch, the Docking Compartment-1, which had occupied the nadir (Earth-facing) docking port of the Zvezda service module, was to be discarded along with a departing Progress cargo ship. It would then be directed to the Earth atmosphere to burn up. The MLM would then use its own engines to rendezvous with the station and dock to the freed nadir port on Zvezda.

An attempt to match the picture in the question but with the DC replaced with MLM. Rendering by Organic Marble using DOUG visualization software.

enter image description here

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  • $\begingroup$ Thanks, that makes a lot more sense. I couldn't figure how the ERA and the airlock would get transferred from Rassvet to MLM in a dump-Rassvet scenario. $\endgroup$ – Organic Marble Aug 30 at 19:01
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    $\begingroup$ I edited to add a picture, please roll back if not welcome. $\endgroup$ – Organic Marble Aug 31 at 13:48

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