An astrophysicist is a scientist who studies the physical properties and behavior of celestial objects and phenomena in the universe. They explore topics such as stars, galaxies, black holes, and the cosmic microwave background. By applying the principles of physics and mathematics, astrophysicists aim to understand the origins, evolution, and fate of the universe. Astrophysicists often use telescopes and other instruments to collect data from space. They may work in research institutions, universities, or government agencies like NASA. Their work contributes to our understanding of fundamental questions about the universe, including the nature of dark matter and the possibility of extraterrestrial life.