Each year, thousands of students around the world take a step closer to the stars—literally and figuratively—through the International Astronomy and Astrophysics Competition (IAAC). The 2025 edition of this prestigious global challenge is now open, and we at the Royal Astronomical Society of Canada – Hamilton Centre are proud to help spread the word.
Launched in 2019, IAAC was created to inspire young minds and cultivate a deeper understanding of the universe. In just a few short years, the competition has reached more than 28,000 students and engaged over 1,400 educators from 120+ countries, making it one of the most accessible and inclusive science competitions in the world.
This isn’t just a test of knowledge—it’s a journey of discovery. Through three rounds of increasingly complex problem sets, students are invited to explore topics in astronomy and astrophysics that go well beyond the standard curriculum. The questions challenge participants to think critically, apply mathematical reasoning, and develop a deeper understanding of celestial mechanics, light, spectra, and the broader cosmos.
How the Competition Works
The IAAC consists of three rounds:
- Qualification Round (Open now until Friday, July 4, 2025)
Students complete a set of five astronomy and astrophysics problems from home. These are designed to be accessible, yet thought-provoking, with options for both younger and older age groups. - Pre-Final Round (August 14–17, 2025)
Qualifying participants move on to a more challenging set of six problems. This stage includes tasks that encourage creative approaches and may involve some research-based answers. - Final Round (September 9, 2025)
Finalists complete a 20-question multiple choice exam under online supervision, with results announced shortly after on September 15, 2025.
Throughout the competition, participants are categorized by age: Junior (under 18), Youth (18–22), and Senior (23+). This makes the IAAC suitable for a wide range of students, from high school to university level.
Rewards That Go Beyond Prizes
While the intellectual challenge is reward enough for many, IAAC also offers some truly inspiring prizes. This year’s winners will receive telescopes signed by astronaut Frank De Winne and Nobel Prize-winning scientists François Englert, Michel Mayor, Gerard ’t Hooft, and Didier Queloz—icons whose work has shaped our modern understanding of physics and astronomy.
Top performers will also receive cash awards, national honors, and certificates of excellence. Schools and educators can receive recognition for their support, and all participants earn certificates noting their involvement and achievements.
A Valuable Opportunity for Students and Educators
For students, IAAC is a unique opportunity to engage deeply with the science of space, gain international recognition, and explore future paths in physics, astronomy, engineering, and data science. For teachers and educators, it offers an exciting enrichment opportunity for STEM programs, as well as access to valuable resources like problem sets, posters, and instructional materials.
Whether you’re a student looking to test your knowledge beyond the classroom, a teacher hoping to spark curiosity in your students, or a parent encouraging a child’s passion for the night sky—this competition offers something for everyone.
Learn More and Get Involved
To access the problem sets, explore resources, or register for the Qualification Round, visit the official IAAC website: https://iaac.space. The deadline for submission is Friday, July 4, 2025 at 23:59 UTC.
If you have any questions or would like additional promotional materials to share with your school, club, or community group, the IAAC team is happy to assist. You can reach them directly at outreach@iaac.space.
We encourage all members of the RASC Hamilton Centre, and the broader astronomy and education communities, to share this opportunity widely. Let’s help the next generation of scientists and explorers discover their place among the stars.
