Node 4

Node 4, also known as the Docking Hub System (DHS), was a proposed module of the International Space Station (ISS).

In 2011 NASA was considering a 40-month design and development effort for Node 4 that would result in its launch in late 2013.

[2] Since the Space Shuttle program was retired, had a decision to build and launch Node 4 been taken, it would have been launched by an Atlas V or Delta IV rocket.

[1] In December 2011 Boeing proposed using Node 4 as the core of an Exploration Gateway Platform to be constructed at the ISS and relocated via space tug to an Earth-Moon Lagrange point (EML-1 or 2).

[3] In June 2020 the Node STA was moved from the Space Station Processing Facility to the Shuttle Landing Facility to make room for commercial partners.