'''Astronomy''' is the [[science|scientific study]] of [[Astronomical object|celestial objects]] (such as [[star]]s, [[planet]]s, [[comet]]s, and [[galaxy|galaxies]]) and [[Phenomenon|phenomena]] that originate outside the [[Earth's atmosphere]] (such as the [[Cosmic microwave background radiation|cosmic background radiation]]). It is concerned with the evolution, [[physics]], [[chemistry]], [[meteorology]], and [[motion (physics)|motion]] of celestial objects, as well as the [[physical cosmology|formation and development of the universe]]. | '''Astronomy''' is the [[science|scientific study]] of [[Astronomical object|celestial objects]] (such as [[star]]s, [[planet]]s, [[comet]]s, and [[galaxy|galaxies]]) and [[Phenomenon|phenomena]] that originate outside the [[Earth's atmosphere]] (such as the [[Cosmic microwave background radiation|cosmic background radiation]]). It is concerned with the evolution, [[physics]], [[chemistry]], [[meteorology]], and [[motion (physics)|motion]] of celestial objects, as well as the [[physical cosmology|formation and development of the universe]]. |