Entry

What Is Astronomy?

Jan 21st, 2008 07:01
Khalid Saleh, Articles Way, Vikram Singh, What Is Astronomy?

There are different definitions of Astronomy. Some define it as a 
branch of science dedicated to the study of the motions and natures of 
celestial bodies, like planets, stars, and galaxies. Others say it is 
the study of objects and matter outside the earth's atmosphere and of 
their physical and chemical properties. Still others would say it is 
the study of everything, because it's a study of the universe and 
everything is part of the universe. 
All three definitions are accurate, but however you define it, there 
are many fields within Astronomy. Cosmologists study the Universe as a 
whole, including its beginnings. Astrometrists measure great 
distances. Planetologists study planets within our own Solar System as 
well as those orbiting distant stars. Radio Astronomers use radio-
telescopes to study the Universe. There are also Mathematical 
Astronomers who use numbers, calculations and statistics to explain 
the universe. 
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Astronomy is not a "stand-alone" science. It combines areas from a 
number of other fields, including mathematics, chemistry, geology, 
biology and physics. In fact, physics is such an integral part of the 
field that many astronomers are also known as Astrophysicists. 
The study of our universe is not new, astronomy is the oldest science. 
People have been looking up, trying to explain the universe for as 
long as there have been people. Some of the earliest Astronomers were 
priests and holy men, studying the movement of celestial bodies to 
determine celebrations and planting cycles. 
The ancient Greeks were the first to start developing astronomy 
theories about the design of the Universe. 
There have been many astronomers throughout history who have played 
important roles in the science. Many have later been proved wrong as 
our knowledge and technology improved, but if not for the earlier 
work, later scientists would have had nothing on which to base their 
research. 
This is only a partial list: 
Ptolemy 
Copernicus 
Tycho Brahe 
Galileo Galilei 
Johannes Kepler 
Isaac Newton 
Edmond Halley 
William Herschel 
Albert Einstein 
Willem de Sitter 
Georges-Henri Lemaitre 
Edwin P. Hubble 
Thomas Gold 
Carl Sagan 
Stephen Hawkings 
For more in-depth information about astronomy, check out our Astronomy 
101, free email basic astronomy course. You can earn a certificate.
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