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                                GALAXY

A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity.
The word is derived from the Greek galaxias, literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. 
Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a thousand stars, 
to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy's centre of mass. 
Most of the mass in a typical galaxy is in the form of dark matter,
with only a few per cent of that mass visible in the form of stars and nebulae. 
Supermassive black holes are a common feature at the centres of galaxies.