STEM Astronomy Club presents

Global Astronomy & Astrophysics Challenge

GAAC is an international team competition for students who can connect astronomy, astrophysics, mathematics, and observation into precise scientific reasoning.

Registration Opens 29 June Competition Format

Registration opens on 29 June 2026.

Teams in Cosmic Quest

Participants

Countries represented

Teams reach knockouts

Competition Format

Individual qualification, then collaborative knockouts.

Round 1

Individual Qualification

Each participant competes individually for 50 minutes across 40 multiple-choice questions. The three scores are combined, and the top 32 teams advance.

Knockout Stage

Team Challenge

From the Round of 32 onward, teams solve 7 non-MCQ questions together in 1 hour, with assigned proctors monitoring every team.

GAAC Pages

Explore the challenge.

Syllabus

The six domains tested across both rounds of GAAC.

Timeline

Registration dates, competition window, and stage progression.

Partners

STEM Astronomy Club and the organizations supporting the season.

Organized By

STEM Astronomy Club

GAAC continues the club mission of making astronomy and astrophysics more accessible, rigorous, and international for ambitious students.

Visit the main club website →