Space looks fascinating from Earth, but what is it actually like to live there?
For astronauts aboard the International Space Station (ISS), everyday activities such as sleeping, eating, exercising and working become very different in the microgravity environment. At the same time, astronauts conduct scientific experiments, maintain spacecraft systems, observe Earth and sometimes perform spacewalks.
So, how is life in space for astronauts? Let's take a closer look at how humans live and work hundreds of kilometres above Earth.
What Is Life Like in Space?
Living in space means adapting to an environment that is very different from Earth. On the International Space Station (ISS), astronauts live in microgravity, where objects appear to float, and ordinary movements require different techniques.
The ISS functions as both a home and a scientific laboratory. Astronauts from different countries live and work together while conducting research, maintaining the station and preparing for future human missions beyond low Earth orbit.
The station has been continuously occupied since November 2000 and normally supports an international crew. It orbits Earth roughly every 90 minutes, so astronauts can experience many sunrises and sunsets in a single day.
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| Expedition-73 and ax-4 astronauts pose for a portrait |
A Day in the Life of an Astronaut
An astronaut's daily routine in space is highly structured.
A typical day can include:
Scientific experiments
Equipment maintenance
Space station inspections
Exercise
Meals
Medical and health activities
Earth observation and photography
Communication with mission control
Training and preparation for spacewalks
Personal or recreational time
Although astronauts live in an extraordinary environment, many parts of their routine are surprisingly familiar. They eat meals, communicate with colleagues, exercise and sleep just like people on Earth — but everything has to be adapted for microgravity.
How Do Astronauts Sleep in Space?
One of the most common questions about life in space is: how do astronauts sleep when there is no normal "up" or "down"?
Astronauts generally sleep inside sleeping bags secured in designated crew quarters. They do not need a conventional bed because their bodies are not pulled toward a floor in the same way they are on Earth.
Crew members follow scheduled sleep periods because maintaining a regular sleep routine is important for health and performance.
The environment of a spacecraft also has to be carefully controlled. Lighting, noise, temperature and daily schedules can all influence sleep quality.
What Do Astronauts Eat in Space?
Food is an important part of an astronaut's life in space.
Space food has to meet several requirements. It needs to be safe, nutritious, relatively lightweight, easy to store and practical to eat in microgravity.
Astronauts can eat a variety of meals, snacks and drinks. Some foods are dehydrated and require water before consumption, while others are ready to eat.
Fresh foods can also be delivered to the International Space Station on visiting spacecraft. NASA has also experimented with growing plants in space, including leafy greens and other crops.
Eating in microgravity presents its own challenges. Loose crumbs and floating particles can become a problem because they can interfere with equipment or enter the cabin environment.
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| Astronauts unpacking fresh fruit supplies |
How Do Astronauts Exercise in Space?
Exercise is essential during long-duration space missions.
In microgravity, astronauts do not use their muscles and bones in the same way they do on Earth. Prolonged exposure can contribute to muscle loss and reduced bone density.
To counter these effects, astronauts exercise regularly using specialized equipment aboard the space station.
Their workouts can include:
Running on a treadmill
Cycling on a stationary bicycle
Resistance exercises
NASA schedules astronauts for substantial daily exercise to help maintain muscle, bone, cardiovascular and overall physical health.
Exercise is therefore not simply a fitness activity in space — it is an important part of an astronaut's health program.
What Do Astronauts Do for Work in Space?
The International Space Station is much more than a place to live. It is an orbiting laboratory.
A major part of an astronaut's working day is devoted to scientific research.
Experiments aboard the ISS cover areas such as:
Biology
Human health
Physics
Chemistry
Materials science
Earth science
Astronomy
Technology development
Microgravity allows scientists to investigate phenomena that are difficult or impossible to study in the same way on Earth.
Astronauts may operate laboratory equipment, collect samples, monitor experiments and maintain research hardware.
The knowledge gained from this research can contribute to future space exploration as well as technologies and medical research on Earth.
Why Do Astronauts Conduct Spacewalks?
Sometimes astronauts need to leave the space station and work outside it. These activities are called Extravehicular Activities (EVAs), commonly known as spacewalks.
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| An astronaut performing a spacewalk |
During a spacewalk, astronauts wear specially designed spacesuits that provide life support and protection from the extreme environment outside the station.
Spacewalks can be performed for tasks such as:
Installing equipment
Maintaining the space station
Upgrading systems
Repairing hardware
Supporting construction activities
Spacewalks are carefully planned because the astronaut is working in the vacuum of space while relying completely on the spacesuit and spacecraft systems for survival.
Astronauts Also Observe Earth
One of the most remarkable experiences of living in space is seeing Earth from orbit.
Astronauts can observe oceans, mountains, deserts, clouds, storms and other natural phenomena from hundreds of kilometres above the surface.
Earth observation is not only visually spectacular. Images and observations collected from space can also contribute to scientific studies of our planet and its changing environment.
Astronaut photography has also become an important way of sharing the experience of space exploration with people on Earth.
How Does Microgravity Affect the Human Body?
The human body evolved to live under Earth's gravity, so living in microgravity produces significant changes.
Some important effects include:
Muscle Loss
Because astronauts do not have to support their body weight in the normal way, some muscles receive less workload. Regular exercise helps reduce this effect.
Bone Loss
Long-duration exposure to microgravity can cause astronauts to lose bone mineral density. Exercise and other countermeasures are therefore important during missions.
Fluid Shifts
In microgravity, body fluids redistribute toward the upper part of the body. This can contribute to changes in the cardiovascular system and other physiological effects.
Changes in Vision
Fluid shifts toward the head can also affect the eyes and vision in some astronauts. NASA continues studying these effects as part of its human spaceflight research.
Understanding these changes is particularly important as space agencies prepare for longer missions to the Moon and eventually Mars.
How Do Astronauts Deal With Isolation?
Living in a spacecraft for months can also be psychologically challenging.
Astronauts work in a confined environment with a small team, far away from their families and normal surroundings.
Training therefore includes more than technical skills. Astronauts also prepare for teamwork, communication, stress management, leadership and unexpected situations.
Communication with family and friends, recreational activities and time for personal interests can help astronauts maintain psychological well-being during long missions.
Strong teamwork is especially important because astronauts depend on one another for safety and mission success.
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| The International Space Station |
What Are the Main Hazards of Living in Space?
Space is a challenging environment, and astronauts face several hazards.
Important risks include:
Microgravity
Space radiation
Isolation and confinement
Sleep disruption
Changes to the human body
Micrometeoroids and orbital debris
The risks associated with spacecraft operations and spacewalks
Space agencies continuously study these hazards and develop technologies, training methods and medical countermeasures to protect astronauts.
This research is becoming increasingly important as human exploration moves beyond the International Space Station toward the Moon and, eventually, Mars.
How Do Astronauts Return to Earth?
Returning from space is a major part of the mission.
A spacecraft leaving orbit must reduce its orbital energy and enter Earth's atmosphere on a carefully controlled trajectory.
During atmospheric re-entry, the spacecraft encounters significant aerodynamic heating. Its heat protection system and flight-control systems are designed to protect the crew and vehicle.
Depending on the spacecraft, the final landing may involve parachutes, landing systems or other recovery methods.
After landing, astronauts undergo medical checks and a period of rehabilitation as their bodies readapt to Earth's gravity.
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| NASA astronaut and Expedition 70 Flight Engineer Loral O’Hara |
How Long Do Astronauts Stay in Space?
The duration of a space mission depends on its purpose and spacecraft operations.
Many International Space Station expeditions have lasted around six months, while some missions have been considerably longer.
For example, NASA's Expedition 74 included an eight-month research mission for a returning crew in 2026.
As human spaceflight develops, longer missions will require even better solutions for food, exercise, sleep, medical care, radiation protection and psychological well-being.
Life in Space and the Future of Human Exploration
The International Space Station provides an important testbed for understanding how humans can live and work away from Earth.
The lessons learned from astronauts living in microgravity can support future human spaceflight programmes, including India's Gaganyaan programme, as well as future missions to the Moon and Mars.
NASA describes the space station as a platform for research and technology development that can help prepare humans for exploration beyond low Earth orbit.
Future explorers may spend much longer periods away from Earth than today's ISS crews. That makes every lesson about life in space increasingly valuable.
NASA Johnson's Video "Everything About Living in Space"
Conclusion
Life in space is a combination of scientific discovery, strict routines, teamwork and constant adaptation.
Astronauts have to sleep differently, exercise regularly, eat specially prepared food and work in an environment where ordinary physical rules feel completely different.
At the same time, they conduct experiments, maintain spacecraft systems, observe Earth and help scientists understand how the human body responds to spaceflight.
India's growing space programme includes missions ranging from human spaceflight to solar and lunar exploration, including Aditya-L1, its dedicated solar mission.
The experience gained aboard the International Space Station is helping humanity prepare for the next stage of exploration — returning to the Moon, an area in which missions such as Chandrayaan-3 have already expanded our understanding, and eventually sending humans farther into the solar system.
The life of an astronaut may look extraordinary from Earth, but behind every spectacular photograph is a carefully planned routine designed to keep humans healthy, productive and safe in one of the most challenging environments imaginable.
Frequently Asked Questions
1. How is life in space different from life on Earth?
The biggest difference is microgravity. Astronauts float rather than walk normally, and everyday activities such as sleeping, eating, exercising and working require specially designed equipment and procedures.
2. How do astronauts sleep in space?
Astronauts sleep in sleeping bags secured inside designated sleeping areas. Because there is no normal floor in microgravity, they do not need a conventional bed.
3. What do astronauts eat in space?
Astronauts eat specially prepared foods designed to remain safe and nutritious during space missions. Meals can include dehydrated foods, ready-to-eat items, snacks and drinks, with occasional fresh food deliveries.
4. How do astronauts exercise in space?
Astronauts use specialized treadmills, stationary bicycles and resistance exercise equipment to help maintain their muscles, bones and cardiovascular fitness.
5. Do astronauts shower in space?
There are no conventional showers aboard the International Space Station. Astronauts use alternative hygiene methods that conserve water and work in microgravity.
6. What happens to the human body in space?
Microgravity can contribute to muscle loss, bone loss, fluid shifts and other physiological changes. Regular exercise and medical monitoring help astronauts manage these effects.
7. How long do astronauts stay in space?
Many ISS missions last around six months, although mission durations can vary. Some astronauts have stayed in space for considerably longer periods.
8. Why do astronauts conduct research in space?
Microgravity provides a unique environment for studying human biology, physics, materials, Earth science and other fields. The results can support future space exploration and may also benefit life on Earth.
9. What is a spacewalk?
A spacewalk, or Extravehicular Activity (EVA), occurs when an astronaut leaves a spacecraft or space station while wearing a spacesuit to perform tasks outside.
10. What happens after astronauts return to Earth?
Astronauts undergo medical evaluations and gradually readapt to Earth's gravity. Rehabilitation and exercise can help them recover from the physical effects of long-duration spaceflight.
