The International Space Station
Five agencies — NASA, Roscosmos, ESA, JAXA, and CSA — assembled the International Space Station (ISS) module by module in low Earth orbit. No space station before it was built, kept running, and crewed with that same level of shared cooperation across national lines. And nothing else in human-made spacecraft even touches its size.
- number_of_modules_and_elements
- 43
Lore & Background
The ISS is the political product of international cooperation in space, combining two previously planned crewed Earth-orbiting stations: the United States' Space Station Freedom and the Soviet Union's Mir-2. The station is divided into two main sections: the Russian Orbital Segment (ROS) and the US Orbital Segment (USOS). The Integrated Truss Structure connects solar panels and radiators to 16 major pressurized modules that support scientific research, crew habitation, storage, spacecraft control, and airlock operations. The ISS has eight docking and berthing ports for visiting spacecraft, including Soyuz, Crew Dragon, and various cargo craft. Future plans include the addition of at least one module, the Payload Power Thermal Module by Axiom Space, forming a commercial segment.
Reader's Guide
The International Space Station represents a landmark in human spaceflight and international collaboration. It is the first space station built and crewed through the joint efforts of multiple nations, demonstrating that long-term orbital habitation and research are achievable through shared resources and diplomacy. Experiments such as the Alpha Magnetic Spectrometer have sought to detect dark matter, while medical studies on bone loss and muscle atrophy inform the feasibility of future interplanetary travel. Its modular design, with 43 elements and eight docking ports, allows for ongoing expansion and resupply. The station's legacy includes advancing knowledge of the space environment, fostering international partnerships, and paving the way for future orbital stations and deep-space missions.
Frequently Asked Questions
Which space agencies operate the ISS?
Five national partners share responsibility for the station: NASA, Roscosmos, ESA, JAXA, and CSA. It is the first space station ever built, maintained, and crewed through this kind of multinational cooperation.
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