Relating to the physics of stars, galaxies, and all objects and phenomena in space.
From astro- (star) combined with physical (relating to physics). The term emerged in the late 19th century as astronomers increasingly applied physics principles to understand celestial objects.
Astrophysics revolutionized astronomy by explaining *why* stars shine (nuclear fusion), not just *where* they are—connecting the physics of atoms to the evolution of galaxies across billions of years.
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