Topics Space and the universe

How do astronauts live on the space station?

Astronauts on the International Space Station live in a pressurized lab about the size of a large house, orbiting Earth roughly every 90 minutes. They are not beyond gravity. They are in constant free fall around the planet, which is why everything floats. They sleep in small private crew quarters, eat packaged food, exercise most days, and spend their working hours on science experiments and keeping the station running.

What makes it interesting is how many ordinary things become engineering problems. Water is recycled, including moisture from the air. Hair washing, using the toilet, and even drinking coffee all need special designs, because liquids and crumbs do not fall down. Bodies change too: without gravity, bones and muscles weaken unless they are worked hard, which is why exercise is a core part of the schedule.

A bre episode on this would walk through a day on board, from waking up to sleeping, and explain the reasons behind each odd routine. You could press Talk and ask what happens to a sneeze in orbit. bre's hosts are AI, so they can make mistakes, and details about the station change as crews and equipment change.

What a bre episode would cover

An outline of the episode bre would make for this question. Every episode is written fresh when you ask, so yours will differ.

  1. Falling around the EarthWhy astronauts float even though gravity is still strong at that height. Orbit is continuous free fall, and the station keeps missing the ground.
  2. Sleeping, eating and staying cleanCrew members sleep in sleeping bags attached to a wall, eat rehydrated and packaged meals, and wash with no-rinse methods and damp towels.
  3. Air and water on boardHow the station keeps breathable air and recycles water, including from humidity in the cabin. Supply ships bring what cannot be made on board.
  4. Exercise against the body's declineMuscles and bones lose strength without gravity's load, so crews use special machines for a couple of hours most days. Some changes still linger after return.
  5. Work, science and repairsMost of the day goes to experiments, maintenance and occasional spacewalks. Researchers study how materials, fire and living things behave in microgravity.
  6. Staying connected and saneCrews talk with family and mission control, look out the windows, and live with a small team for months. What is known about the mental side, and what is still being studied.

How the episode might open

A sample exchange between two of bre’s AI hosts, bre and Arlo. Both are AI; this is written by AI, as every bre episode is.

  1. breAI host

    Let's start with a picture. An astronaut wakes up, and she's upside down relative to the floor, except there is no floor. Where do you even begin the morning?

  2. ArloAI host

    Zip yourself out of the sleeping bag. Not much more to it.

  3. breAI host

    Right, but the bag is attached to a wall so you don't drift into a laptop overnight. That's the first odd rule. Nothing stays where you put it unless you fasten it.

  4. ArloAI host

    So everything gets tied down. Fair enough.

  5. breAI host

    And the part people get wrong: there's still gravity up there. Quite a lot of it. So why are they floating?

  6. ArloAI host

    Who counted that? How much gravity is it, really?

  7. breAI host

    Roughly ninety percent of what you feel on the ground, give or take. They float because the whole station is falling around the Earth, and so are they.

  8. ArloAI host

    Falling, but missing. Okay. That I buy.

Questions people also ask

Is there gravity on the space station?
Yes. At the station's height, Earth's gravity is still strong, nearly as strong as on the ground. Astronauts float because the station and everyone in it are in free fall around the planet, so they feel weightless. This condition is called microgravity.
How do astronauts sleep in space?
They sleep in sleeping bags fastened to a wall or inside small private crew cabins, so they do not drift around. Without up or down, any direction works. Many crew members report using earplugs and eye masks because the station is noisy and bright.
How do astronauts go to the toilet on the space station?
They use a toilet that works with airflow, which pulls waste away instead of relying on gravity. Urine is collected and processed, and much of the water is recycled. Solid waste is stored and later removed from the station in cargo vehicles.
How long do astronauts stay on the space station?
Typical stays last about six months, though some missions are shorter or longer. A few astronauts and cosmonauts have stayed close to a year. Crews rotate, so the station has been continuously occupied for over two decades.

Related topics

More: all 300 topics, space and the universe, or the longer reads on /learn.

bre’s hosts are AI, and every episode is generated, so they can be wrong: check anything that matters. This page outlines what an episode would cover. It is for interest and learning, not medical, financial or legal advice.