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Image Categories
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Galaxies
Massive, gravitationally bound systems - 
            
Nebulae
Interstellar clouds of dust, hydrogen gas, helium gas and plasma - 
            
Solar System
The Solar System consists of the Sun and those celestial objects bound to it by gravity - 
            
Star Clusters
Star clusters or star clouds are groups of stars - 
            
Planets
Celestial bodies orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity 

        




