Astronomy is a natural science that deals with the study of celestial objects ( such as stars, planets, comets, nebula, star clusters and galaxies ) and phenomena that originate outside the Earth's atmosphere. Study of astronomy include with the evolution, physics, chemistry, meteorology, and motion of celestial objects, as well as the formation and development of the universe. So,astronomy is a dynamic science and progress forward with the new discovery of the scientists.
Astronomy is one of the oldest sciences. Prehistoric cultures left behind astronomical artifacts such as the Egyptian monuments and Stonehenge, and early civilizations such as the Babylonians,Greeks, Chinese, Indians, and Maya performed methodical observations of the night sky. However, the invention of the telescope was required before astronomy was able to develop into a modern science. Historically, astronomy has included disciplines as diverse as astrometry, celestial navigation, observational astronomy, the making of calendar, and even astrology, but professional astronomy is nowadays often considered to be synonymous with astrophysics.
Nowadays, astronomy divided into 2 big branches, the theory and the observations. The theory based on the idea created by scientists,as example "Big bang Theory" is the one,created by Edwin Hubble, the one of the oustanding astronomer. Through the theory , we could describe the phenomena of astronomy,as example created of universe ,explain by the "Big Bang Theory". Observational astronomy based on the observation of astronomers. The astronomers gather the data and make a summation that created an astronomy law. Of course, making the law using the basic priciples of physics.
Many Astronomical object or law's found by the amateur astronomers .They contributed so many .Their summary or observation's data gathered and created an astronomy's law ,as it written before.
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