The GATEWAY (formerly the Deep Space Gateway)

                                                                                                           The   GATEWAY is supported by the Multilateral
                                                                                                          Coordination Board
 (MCB).  It has its roots in the
                                                                                                          Cis-lunar base envisioned back in the 2010's. The
                                                                                                          GATEWAY is currently intended to support lunar
                                                                                                          operations and be a stepping stone to Mars
.
 
                                                                                                          GATEWAY construction will be performed  by the
                                                                                                          SLS and Lockheed-Martin ORION.  Allthough initially
                                                                                                          scheduled to begin in 2018 and complete in 2025
                                                                                                          due to the status of the SLS and ORION the start
                                                                                                          time is now estimated to be no earlier than mid 
                                                                                                          2021.

                                                                                                          Historical information on GATEWAY from
                                                                                                          RUSSIANSPACEWEB
.



March 30, 2012 - NASASPACEFLIGHT published "Deep Space Habitat module concepts outlined for BEO (Beyond Earth Orbit) exploration".  When you consider the hab would require "life-support systems, sleep stations, exercise machines, science lab space and robotitic workstations" habitat space starts to shrink for a 4-astronaut 500-day configuration.

March 27, 2018 - NASA released the "Future Human Exploration Planning: Lunar Orbital Platform-Gateway and Science
Workshop Findings".

May 2, 2018 - NASA published the page "NASA's Lunar Outpost will Extend Human Presence in Deep Space"

September 8, 2018 - SPACE.COM published "Take a Look Inside Lockheed Martin's proposed Lunar "Gateway" Habitat for Astronauts". The habitat is reportedly 15' wide and nearly 22' long with astronauts occupying space for up to 90 days.

September 11, 2018 - NASASPACEFLIGHT published "NASA Updates Lunar Gateway Plans".

December 7, 2018 NASA
published "Status of Gateway Power and Propulsion Element (PPE).

May 11, 2019 - NASASPACEFLIGHT published "Northrop Grumman, NASA test Cygnus-derived lunar gateway habitat"

The first element of the GATEWAY to be launched is the Power and Propulsion Element (PPE). It's intended to be a
50-kilowatt solar electric propulsion spacecraft.  Per NASA it is not expected to be launched until late 2022.

May 23, 2019 NASA awarded "Maxar Technologies, formerly SSL, in Westminster, Colorado to develop and demonstrate
 power, propulsion and communications capabilities for NASAs's lunar GATEWAY.

To date it appears the most current information (not considering projected schedule) is provided by Wikipedia .

2018 Global Exploration Roadmay

March 16, 2020 - NASA removes lunar gateway  from Artemis critical pat h
March 20, 2020 NASASPACEFLIGHT GATEWAY removed for projected 2024 lunar landing
March 27, 2020 NASA awards contract for GATEWAY logistics services 
March 30, 2020 Backstep to Apollo - now a lunar lander proposed to go with the manned capsule

 

Photograph courtesy of NASA (Click on the image)

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