Galaxy

Astronomical Dictionary

Vast star systems containing thousands of billions of stars, dust and gas, held together by gravity. Galaxies are the basic building blocks of the Universe. There are three main classes, Elliptical, Spiral and Barred, named after their appearance.

 
Astronomical [1] [2] [3] [4] [5] [6] [7] [8] [9]

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Astronomical Dictionary
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