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| Milky Way. Photo: NASA |
When a system of millions of billions of stars together with gas and dust held together by gravitational attraction is called a galaxy. Our galaxy is called the Milky Way. The word galaxy is derived from the Greek word Galaxias. Galaxies contain star systems, star clusters and interstellar clouds etc. The galaxy nearest to our own is the Andromeda Galaxy. Some types of galaxies are spiral galaxies, elliptical galaxies and irregular galaxies. There are probably more than 170 billion galaxies in the observable universe. Galaxies are said to be formed by the Big Bang.
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