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Subject
- observational astronomy[remove]151
- surveys37
- galaxies34
- galactic and extragalactic astronomy22
- stars21
- ultraviolet astronomy17
- space observatories13
- nebulae12
- optical astronomy12
- planets12
- solar system astronomy12
- stellar astronomy12
- variable stars11
- cosmology10
- x-ray sources9
- spectroscopy8
- uv astronomy8
- infrared astronomy7
- optical astronomy7
- photometry6
