1. What Was Gateway Supposed to Be?
Gateway was planned as the first space station to orbit the Moon, part of NASA's Artemis program for returning people to the lunar surface. The International Space Station (ISS) circles Earth; Gateway would have circled the Moon. [1]
It was meant to be small. NASA's numbers put it at roughly one-fifth of the ISS by volume, about 20 meters long compared with the ISS's 109 meters, with room for up to four astronauts in its early form. Unlike the ISS, it would not have had people aboard all the time. It was designed to run on its own, with remote and automated operations, between visits. [1]
The idea was a staging post. ESA, the European Space Agency, compares it to a mountain hut stocked before a climb: rockets could reach Gateway, and astronauts could rest there and make trips down to the surface, instead of flying all the way from Earth every time. [2]
2. Why an Egg-Shaped Orbit Instead of a Circle?
The orbit is called a near rectilinear halo orbit, or NRHO. You do not need to remember the name. What matters is its shape: very stretched, passing close to the Moon and then swinging far out. One loop takes about 6.5 days. [1]
The two ends of the oval offer different advantages. ESA explains that when the station is closest to the Moon, trips down to the surface are easier because the distance is shorter. When it is farthest away, it is easier to pick up astronauts and supplies arriving from Earth. [2]
The shape also helps in three other ways that both agencies describe. It takes less fuel to keep a station in this orbit than in a closer circular one. The orbit is designed to keep Earth in view, so the Moon does not block the station's radio link. And NASA says the polar path gives access to the whole lunar surface, including the south pole region that Artemis is aimed at. [1] [2]
So the oval is a compromise. A low circular orbit might make trips between the station and the surface shorter, but it would use more fuel. An orbit chosen to favor only one thing would have given up the others. This one gives up a little of each to get all of them.
Sources disagree on the closest distance. NASA's FAQ says about 1,500 km at the closest point and about 70,000 km at the farthest. ESA says about 7,000 km and 70,000 km. The agencies do not explain the gap. It may come from measuring the distance in different ways (for example, from the surface versus from the Moon's center), but that is our guess, not something either source says. [1] [2]
3. Which Countries Were Building Which Parts?
No single country was building Gateway. Five space agencies were contributing: NASA, Canada's CSA, ESA, Japan's JAXA, and the UAE's MBRSC. [1]
NASA's two core pieces were the Power and Propulsion Element (PPE), built by the company Lanteris Space Systems, and a first living-and-supply module called HALO, built by Northrop Grumman. The PPE produces 60 kilowatts and was described as the most powerful solar-electric spacecraft ever flown. Canada was supplying the robotic arm Canadarm3. ESA was building a crew module (Lunar I-Hab), a supply-and-viewing module (Lunar View) and a communications system (Lunar Link). The UAE was supplying an airlock. [1] [2]
Japan's share included life-support equipment for I-Hab, temperature-control functions and cameras, batteries for HALO and I-Hab, and an uncrewed cargo ship called HTV-XG to deliver supplies. [1]
4. What Did NASA Announce in March 2026?
On March 24, 2026, NASA Administrator Jared Isaacman said at a NASA event: "we intend to pause Gateway in its current form and focus on building lunar infrastructure that supports sustained operations on the surface." He added that NASA would "pivot agency talent and hardware already working on Gateway to the surface or other programs." [3]
The word he used was "pause," not "cancel," and this article keeps that wording. NASA's partners, ESA, Canada and Japan, had worked on the project as an international effort, and the report notes the news may have surprised them. [3]
5. Where Are the Gateway Parts Going Now?
Nothing here is final, and plans can change.
NASA's power and propulsion module. A space-news newsletter reports that NASA said the PPE would be reused for a mission to Mars called Space Reactor-1 (SR-1) Freedom, which would test nuclear-electric propulsion. The target is the Earth-to-Mars launch window of late 2028. We read this through a secondary source, so treat it as a plan rather than a certain launch. [4]
Europe's modules. After a meeting on June 17, 2026, ESA said it would keep developing I-Hab until its critical design review, the last big design step before full-scale building, and only then decide whether it can be reused. Lunar View would continue at a slower pace. Lunar Link might become a communications asset, possibly part of Moonlight, a planned set of satellites around the Moon. More clarity may come at a meeting of ministers in December. [5]
The others. In the sources we read, no decision was given for Canadarm3, Japan's cargo ship, or the batteries. "Paused in its current form" does not mean the work of each part disappears. It looks more like a moment when the parts are being reassigned. For the latest news, check the agencies' own announcements and note their dates.
6. How Can You Explore the Orbit Yourself?
Draw a small Moon on a sheet of paper, then draw a long egg-shaped loop around it so that one side of the loop passes close to the Moon and the other side stretches far away. Label the near side "easy trips down to the surface" and the far side "easy to meet visitors from Earth." Then try explaining why a plain circle would not do both jobs as well, in your own words or in a note.
If you want to go further, read the NASA and ESA pages listed below and compare how each one describes the orbit. Why might their closest-distance numbers differ? That is a good question to chase.