A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. […] Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million stars, to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy’s center of mass. [1]

Bode’s Galaxy – Messier 81
The Bode's Galaxy is a spiral Galaxy in the constellation Ursa Major. The galaxy is about 12.000.000 LJ away. Another ...
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Cigar Galaxy – Messier 82
The Cigar Galaxy is an irregular galaxy in the constellation Ursa Major and is about 14.000.000 LJ away. Another catalog ...
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Pinwheel Galaxy – Messier 101
The Pinwheel Galaxy is a spiral galaxy in the constellation Ursa Major. The galaxy is about 16.000.000 LJ away from ...
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Triangulum Galaxy – Messier 33
"The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC (New General Catalogue) 598. With the D25 isophotal diameter ...
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- Galaxy – Wikipedia 22/10/06[↩]