Here are the planned space stations expected to make significant progress or become operational by 2030, ordered from largest to smallest based on their planned volume, mass, or crew capacity, where data is available. Note that exact sizes are not always fully specified, so I’m using the best available metrics (e.g., volume, mass, or crew capacity) and making reasoned estimates where necessary.
Tiangong Expansion (China) Size/Metrics: ~180 tons (expanded configuration), six modules, ~100–150 m³ internal volume (estimated based on current 90 m³ for three modules). Supports 3–6 crew members.
Details: China’s Tiangong, already operational, will expand with a new core module and the Xuntian telescope by 2026, making it the largest by mass and module count.
Timeline: Expansion by 2026.
Status: Active, with expansion plans in progress.
Axiom Station (Axiom Space) Size/Metrics: ~400–500 m³ (estimated, nearly double the ISS’s usable volume of ~241 m³), multiple modules, supports 4–8 crew.
Details: Starts as ISS modules, detaching to form an independent station by 2030. Features large cupola and advanced research facilities.
Timeline: First module launch in 2026, independent by 2030.
Status: On schedule, hardware in development.
Orbital Reef (Blue Origin, Sierra Space, et al.) Size/Metrics: ~830 m³ (based on Sierra Space’s LIFE module and core modules), supports up to 10 people.
Details: A commercial LEO station with inflatable habitats and large windows, designed for research and tourism.
Timeline: Operational by 2027–2028.
Status: In development, with testing milestones achieved.
Starlab (Voyager Space, Nanoracks, Lockheed Martin) Size/Metrics: 340 m³ (inflatable habitat), supports 4 crew members.
Details: Single-launch LEO station for research and commercial use, using SpaceX’s Starship.
Timeline: Launch in 2028.
Status: Progressing, with system tests underway.
Lunar Gateway (NASA, ESA, JAXA, CSA) Size/Metrics: ~125 m³ (estimated for initial modules), 40 tons, supports 4 crew for short missions.
Details: Lunar-orbiting station for Artemis missions and Mars research, smaller due to its specialized role.
Timeline: First modules launch in November 2025.
Status: In active development.
Haven-1 (Vast) Size/Metrics: ~100 m³ (estimated, single module), supports 4 crew.
Details: Compact LEO station for commercial use, scalable to connect with larger structures later.
Timeline: Launch in late 2025.
Status: Development on track, launch contracted.
Indian Space Station (ISRO) Size/Metrics: ~50–80 m³ (estimated, single module), supports 2–3 crew for short stays.
Details: Small LEO station for microgravity research, serviced by Gaganyaan spacecraft.
Timeline: First module by 2028, completion by 2035.
Status: Early planning, feasibility studies ongoing.
Notes:Ranking Basis: Ordered primarily by internal volume (where available) or mass/crew capacity. Tiangong’s mass (180 tons) places it first, while Axiom and Orbital Reef have larger volumes. Haven-1 and ISRO’s station are smaller, single-module designs. Exact volumes for some projects are estimates, as full designs are not public.
Uncertainties: The Russian Orbital Space Station (ROSS) was excluded due to unclear progress and lack of confirmed size metrics. Bigelow Aerospace projects are inactive. Timelines and sizes may shift due to technical or funding challenges.
Sources: Data drawn from NASA’s commercial space updates (
https://www.nasa.gov/humans-in-space/commercial-space/), SpaceX announcements, and ISRO statements. For real-time updates, check these sources or X posts from relevant organizations.
https://x.com/i/grok/share/s7QREmcQcojAwNBqAB08hUHRw