Life Aboard the International Space Station: A New Era of Human Spaceflight

As of May 2026, the International Space Station (ISS) continues to serve as a vital hub for international cooperation and scientific advancement. With 781 humans having traveled into space since the dawn of spaceflight, the station remains a focal point for research, technology testing and the ongoing expansion of our presence in low Earth orbit.

The Evolution of the Astronaut Corps

The term “astronaut,” derived from the Greek words for “star sailor,” serves as the formal designation for those trained and deployed by NASA to serve as crew members on spacecraft bound for orbit and beyond. Since the inception of the program, NASA has selected 370 astronaut candidates, maintaining a diverse corps that includes both military and civilian professionals, pilots, and non-pilots.

Today, the ISS typically hosts seven crew members at any given time. These individuals represent a variety of nations and agencies, working together in a continuous human presence that has been maintained since the arrival of Expedition 1 on November 2, 2000. Among the current generation of space explorers are professionals like ESA astronaut Sophie Adenot, who serves as a Flight Engineer for Expedition 74/75.

Scientific Research in Microgravity: The Columbus Module

Central to the station’s research capabilities is the Columbus laboratory module. As the European Space Agency’s (ESA) largest contribution to the ISS, this multifunctional pressurized laboratory is permanently attached to the station’s Harmony module. Since its installation in 2008, Columbus has provided a unique environment for studying the long-term effects of microgravity on the human body.

The laboratory is equipped with advanced facilities, including the Advanced Plant Habitat, which supports space botany research. This work is critical for NASA and its international partners as they develop the technology necessary to sustain human crews on long-duration missions farther away from Earth. Beyond the internal racks, Columbus also features four exterior platforms, allowing researchers to conduct experiments in the vacuum of space, ranging from Earth observation to fundamental space science.

Key Takeaways: Understanding Modern Spaceflight

• Continuous Presence: Humans have lived and worked on the ISS without interruption for over two decades.
• International Cooperation: The station functions as a collaborative environment where astronauts from various space agencies work alongside one another.
• Research Versatility: Facilities like the Columbus module allow for both internal biological research and external experiments in the space environment.
• The “Astronaut” Designation: While “astronaut” is the standard term for NASA crew members, other agencies and nations utilize distinct terms, such as “cosmonaut” for those fielded by Roscosmos, to describe their space travelers.

Frequently Asked Questions

What is the primary purpose of the Columbus module?

The Columbus module is a pressurized laboratory designed to conduct a wide variety of research in a weightless environment. It enables scientists to study human health in microgravity and test technologies for future deep-space exploration.

How many people have flown in space?

As of April 2026, 781 humans have flown in space. Many of these missions have been dedicated to supporting the ongoing operations and research efforts aboard space stations.

Who manages the astronauts on the ISS?

Astronauts are managed by their respective national agencies. NASA maintains its own corps of active astronauts eligible for flight assignment, while international partners like the ESA and Roscosmos manage their own crews, who then coordinate operations as a unified team once they reach the station.

As we look toward the future of space exploration, the work conducted aboard the International Space Station remains the cornerstone of our ability to live and work in the stars. By refining our understanding of life in microgravity today, we are effectively building the foundation for the next chapter of human discovery in the solar system.