An astrophysicist studies the physics of the universe, including stars, planets, galaxies, and cosmic phenomena. They use mathematical models and observational data from telescopes and space missions to understand how celestial objects form, evolve, and interact. Astrophysicists work in research institutions, universities, space agencies, and industries related to aerospace or data science. Their work can involve theoretical research, computational simulations, or analyzing astronomical data to explain fundamental aspects of the cosmos.