PurPassionSky

Astronaut

The pull to understand what isn't yet understood

Discovery · Unknown → Known

The shape of the work

Pace
  • A steady rhythm with room to breathe
  • Short, intense, and the stakes are right now
What your week looks likeLong continuous stretches of focused work
How much you move around at workOn your feet, using your body most of the day
Whether you can work from anywhereYou need to be there on location
How quickly you receive feedback on your workYou know within hours
What you're actually working withNumbers, measurements, records — things you read on a screen / Other humans, face-to-face — talking, teaching, treating, leading / Materials, organisms, land, equipment — things you can touch

Behaviours this work is made of

Core
  • Manipulating variables, testing, seeing what happens.
  • Going into unmapped territory, literal or intellectual.
  • Building specific capacities through practice.
Also present
  • Working with others toward a shared thing.
  • Exchanging meaning — both transmitting and receiving, adjusting in response.
  • Iterative diagnosis under uncertainty.

In words

An astronaut is a trained crew member on a spacecraft or space station. Most of the time is not spent looking at Earth. It goes on running science experiments for researchers on the ground, maintaining and repairing station systems, and exercising, with occasional spacewalks and docking operations. Before any flight there are years of training: spacecraft systems, robotics, spacewalk practice underwater, emergency drills, survival training, and usually a second or third language. The main pull is Discovery, because astronauts are the hands and eyes for experiments nobody can do on Earth, with Resolution close behind, since nobody can send a technician when something breaks.

The job has different names in different places. NASA and ESA say astronaut, Russia's Roscosmos says cosmonaut, and China's programme says taikonaut. The largest space agencies (NASA, ESA, JAXA in Japan, the Canadian Space Agency, and the Indian and Chinese programmes) all run crewed spaceflight or have astronauts flying on partners' missions, and private companies now fly commercial crews too.

There's a guide here if you want one

Kitsune can talk through anything on this page — whether it might suit you, what to do next, questions this page doesn't answer. Everything here is yours to read either way.

The numbers are very small. NASA chose 10 candidates from more than 8,000 applicants in 2025, and ESA chose 5 career astronauts and 11 reserve astronauts from more than 22,500 applicants in 2022 [official 2022, 2025]. Most astronauts wait years between selection and a first flight, and some never fly. Nobody plans a career around becoming one. People plan a first career (pilot, engineer, doctor, scientist) and apply when a selection opens, which may be once in a decade.

What an astronaut most needs is to be pleasant, competent and calm in a small space with the same people for six months, more than to be brave. Selection tests for that on purpose. Most of the job is also done on Earth: an astronaut spends far more of a career in training, in mission support roles and giving talks than in orbit.

There is no astronaut degree. Agencies ask for a first career built on a strong science, engineering, medicine or piloting background, usually a master's-level degree or equivalent and a few years of professional experience, plus passing demanding medical and psychological screening. NASA's requirements, for example, include a STEM master's degree and two years of relevant experience or 1,000 hours as pilot in command [official 2025]; other agencies' rules differ, and some (ESA, for instance) recruit only from their member countries' citizens, so nationality matters. The realistic step for a student is to build the first career well. Selection rounds are announced publicly and are open to anyone who meets the criteria.

Before you go