The branch of astronomy that deals with the physical properties and behavior of celestial bodies and phenomena.

खगोल भौतिकी

English Usage: He decided to pursue a degree in astrophysics due to his fascination with black holes.

Hindi Usage: उसने काले छिद्रों के प्रति अपनी रुचि के कारण खगोल भौतिकी में डिग्री लेने का निर्णय लिया।