About galaxies

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galaxy is a huge group of many stars and space dust. The word "galaxy" is taken from the greek word galaxies, where this word goes to the milky way, our galaxy.
There are various types of galaxies: elliptical, spiral and leticular galaxies, which can all be with or without bars. Then there are irregar galaxies. All galaxies exist inside the universe. There are probably over 170 billion (1.7x1011) galaxies within the observable universe.

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