Astrophysics is the branch of astronomy that deals with the physical properties and behavior of celestial bodies. Terms like black holes, quasars, and dark matter are central to understanding the universe's structure and evolution. Astrophysics also covers the study of stars, galaxies, and cosmic radiation, helping us understand how the universe works on a fundamental level.
For instance, the term “event horizon” refers to the boundary around a black hole where not even light can escape. The study of gravitational waves, first detected in 2015, is another recent breakthrough in astrophysics that provides insight into space-time and the behavior of massive objects.