天体物理学 tiāntǐwùlǐxué astrophysics Origin Definitions Defs Strokes Stroke Words Sentences Sents 天体 天體 tiāntǐ noun celestial body General term for objects in the universe, including stars, planets, satellites, comets, meteors, and cosmic dust物理学 物理學 wùlǐxué noun physics the science of matter and energy and their interactions; the study of the laws and structure of the physical world