Few career dreams are as universal as wanting to fly in space. If you have ever looked up at the night sky and wondered how to become an astronaut, you are in good company — and you might be closer to a realistic path than you think. While astronaut selection is famously competitive, the qualifications are clearly defined, the routes into the profession have multiplied in recent years, and every single person who has flown to orbit started exactly where you are now: on the ground, with a plan. This guide walks through the requirements, the steps, and the newer commercial and international routes that are opening the door wider than ever.
What Does an Astronaut Actually Do?
Before mapping the path, it helps to understand the job. Modern astronauts are far more than pilots. Aboard the International Space Station and future commercial stations, they work as scientists running hundreds of experiments, as engineers maintaining life-support and power systems, as robotics operators, and occasionally as spacewalkers performing repairs in the vacuum of space. Between flights — which is most of an astronaut’s career — they train, support missions from the ground, test new spacecraft, and serve as public ambassadors for spaceflight. The role rewards generalists: people who can learn almost anything quickly and stay calm while doing it.
How to Become an Astronaut: The Basic Requirements
For NASA’s astronaut corps, the published requirements are surprisingly attainable. You must be a U.S. citizen, hold at least a master’s degree in a STEM field (engineering, biological science, physical science, computer science, or mathematics) or an equivalent qualification such as a medical degree or test pilot school completion, and have at least two years of related professional experience — or at least 1,000 hours of pilot-in-command time in jet aircraft. You also need to pass the NASA long-duration flight astronaut physical. Notice what is not on the list: you do not need to be a military pilot, you do not need perfect uncorrected vision (correctable vision is acceptable), and there is no formal age limit.
Step 1: Earn the Right Degree
Every astronaut path begins with a STEM education. Aerospace, mechanical, and electrical engineering are well-represented in the astronaut corps, but so are geology, medicine, oceanography, and computer science. The best advice is to choose the field you would happily work in even if you never flew — because statistically, most applicants will spend their careers there. Excel in it. Selection boards look for people who are outstanding in their discipline, not people who chose a major purely as an astronaut checkbox. Plan on graduate school: a master’s degree is now the baseline for NASA selection, and many recent astronauts hold doctorates or medical degrees.
Step 2: Build Meaningful Professional Experience
After your degree, NASA wants to see at least two years of increasingly responsible professional experience — and in practice, successful candidates usually have far more. Flight experience, research expeditions, medical practice, engineering leadership, and operational roles in demanding environments all count. What matters is demonstrated performance in settings where the stakes are real: flying aircraft, working in Antarctica, running a hospital emergency department, leading a spacecraft test campaign. Seek out roles that combine technical skill with operational pressure and teamwork.
Step 3: Get in Shape — Physically and Mentally
You do not need to be an elite athlete, but you do need to pass a demanding flight physical and sustain fitness for spacewalk training, which is often described as the most physically punishing part of the job. Build cardiovascular endurance, functional strength (especially grip and upper body for spacesuit work), and become a confident swimmer — water survival training and the Neutral Buoyancy Laboratory are core parts of astronaut preparation. Mental resilience matters just as much: astronauts spend months in confined quarters, far from family, executing precise work on little sleep. Practices that build calm under pressure — from aviation to wilderness expeditions to meditation — are all relevant preparation.
Step 4: Apply Through NASA’s Astronaut Candidate Program
NASA opens astronaut applications roughly every four years, posting the announcement on USAJOBS. Recent selection rounds have drawn over 12,000 applicants for classes of ten or so — long odds, but far better than a lottery, because selection is not random. The process includes application screening, references, two rounds of in-person interviews, medical evaluations, and team exercises. Selected candidates then complete about two years of basic training in spacecraft systems, spacewalking, robotics, T-38 jet operations, and Russian language before earning astronaut wings. Most successful candidates applied more than once; persistence is part of the profile.
How to Become an Astronaut Through Commercial Spaceflight
The biggest change in a generation is that NASA is no longer the only door. SpaceX flies private crews to orbit on Crew Dragon, Axiom Space has flown multiple private astronaut missions to the ISS and is building a commercial station, and companies like Blue Origin and Virgin Galactic have carried dozens of people on suborbital flights. Beyond paying customers, these companies increasingly need professional crew: commercial astronauts, mission specialists, and crew trainers. Polaris Dawn demonstrated the first commercial spacewalk, and future commercial stations will need staff. Watching the careers pages of SpaceX, Axiom, Blue Origin, Sierra Space, and Vast is now a legitimate part of an aspiring astronaut’s job search.
International Routes: ESA, CSA, JAXA, and Beyond
If you are not a U.S. citizen — or hold dual citizenship — look at your own national agency. The European Space Agency, Canadian Space Agency, JAXA in Japan, and agencies in the UAE, India, and elsewhere all run astronaut selections, each with slightly different requirements. ESA’s most recent selection introduced a parastronaut feasibility project, opening the path to candidates with certain physical disabilities for the first time. Requirements broadly mirror NASA’s: STEM education, professional excellence, medical fitness, and exceptional teamwork.
Skills That Make Astronaut Candidates Stand Out
Beyond the formal requirements, selection boards consistently reward a cluster of skills: operational experience (flying, diving, expedition work), a second language (Russian remains valuable, and Mandarin is rising), teaching and communication ability, and evidence that you are a good crewmate — someone others want to be locked in a small can with for six months. Former astronauts are remarkably candid about this. Chris Hadfield’s An Astronaut’s Guide to Life on Earth Chris Hadfield (#ad): it is widely considered essential reading for understanding the astronaut mindset, from sweating the small stuff to aiming to be a zero before you try to be a plus one.
What If the Odds Don’t Break Your Way?
Here is the encouraging secret of astronaut ambitions: the preparation is never wasted. The same path — a strong STEM career, operational excellence, fitness, teamwork — leads directly into mission control, spacecraft engineering, flight surgeon roles, spacesuit design, and astronaut training positions. The space industry employs hundreds of thousands of people who make spaceflight happen without leaving Earth, and demand is growing. Aim for the corps, and you will land somewhere remarkable either way.
Helpful Resources for Aspiring Astronauts
These well-loved picks can help you build knowledge, skills, and inspiration while you work toward your application:
- How to Astronaut Terry Virts (#ad): A funny, practical insider’s manual from a former ISS commander covering everything from training to spacewalks — a realistic preview of the job you’re chasing.
- Celestron Travel Scope 70 Telescope (#ad): An affordable, portable starter telescope that keeps your connection to the sky alive and makes a great entry point into practical astronomy.
- Estes Alpha III Model Rocket Launch Set (#ad): A classic beginner model rocketry set that teaches real aerospace fundamentals — propulsion, stability, recovery — through hands-on launches.
Your Next Step
Becoming an astronaut is a long game, but it is played one concrete move at a time. This week, pick your move: research the STEM degree that excites you most, sign up for swimming or flying lessons, or read a current astronaut’s biography and study how they built their path. Write down where you want your resume to be in five years, then take the first step toward it. Every astronaut’s journey started with a decision that the dream was worth working for — make yours today.
