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Astronomy is a natural science that studies celestial objects and phenomena. It applies mathematics, physics, and chemistry, in an effort to explain the origin of those objects and phenomena and their evolution. The objects of interest include planets, moons, stars, galaxies, and comets; while the phenomena include supernovae explosions, gamma ray bursts, and cosmic microwave background radiation. More generally all astronomical phenomena that originate outside Earth's atmosphere are within the purview of astronomy. A related but distinct subject, physical cosmology, is concerned with the study of the Universe as a whole.
Astronomy is the oldest of the natural sciences. The early civilizations in recorded history, such as the Babylonians, Greeks, Indians, Egyptians, Nubians, Iranians, Chinese, and Maya performed methodical observations of the night sky. Historically, astronomy has included disciplines as diverse as astrometry, celestial navigation, observational astronomy and the making of calendars, but professional astronomy is now often considered to be synonymous with astrophysics.
During the 20th century, the field of professional astronomy split into observational and theoretical branches. Observational astronomy is focused on acquiring data from observations of astronomical objects, which is then analyzed using basic principles of physics. Theoretical astronomy is oriented toward the development of computer or analytical models to describe astronomical objects and phenomena. The two fields complement each other, with theoretical astronomy seeking to explain the observational results and observations being used to confirm theoretical results.
Astronomy is one of the few sciences where amateurs can still play an active role, especially in the discovery and observation of transient phenomena. Amateur astronomers have made and contributed to many important astronomical discoveries, such as finding new comets.



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  1. etrain16

    Anyone Traveling to See the Total Eclipse in August??

    I very clearly remember the last total eclipse in our area in 1979. I was 10 at the time and thought it was quite fascinating to see it go from light to total darkness. I studied Astronomy in school, so events like this still peak my interest. Fast forward to 2017 and my daughter is now 10 and...
  2. ATCclears

    Pics of the cosmos (taken in Shelton, WA)

    <broken link removed> Note the estimated distances in light years from us. For example, Messier 101 (the pinwheel galaxy) is estimated to be 21,000,000 light years away).
  3. ATCclears

    New star in night sky in 2022

    Spectacular collision of suns will create new star in night sky in 2022
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