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Galaxies: star formation (6) |
ISM: clouds (6) |
Galaxies: ISM (5) |
ISM: structure (5) |
ISM: molecules (4) |
Stars: formation (2) |
Galaxies: evolution (1) |
Galaxies: individual (NGC 628) (1) |
Galaxies: spiral (1) |
H II regions (1) |