Astronomy is one of the oldest natural sciences and studies celestial objects (such as moons, planets, stars, nebulae, and galaxies), the physics, chemistry, mathematics, and evolution of such objects, and phenomena that originate outside the atmosphere of Earth, including supernovae explosions, gamma ray bursts, and cosmic background radiation. Theoretical astronomy is oriented towards the development of computer or analytical models to describe celestrial phenomena. A related but distinct subject, cosmology, is concerned with studying the universe as a whole.Shine on the web
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