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compulsory mark
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compulsory mark
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Galactic ridge
Galactic rotation
galactic rotation
Galactic rotation curve
galactic rotation curve
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Galactic source
galactic space
Galactic spiral structure
Galactic spur
Galactic stellar disk
Galactic structure
galactic structure
Galactic subsystem
galactic superbubble
Galactic supernova
galactic supernova
Galactic supernova remnant
Galactic System
galactic system
galactic thick disk
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