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Subject
- galaxies[remove]19
- observational astronomy11
- galactic and extragalactic astronomy6
- stars6
- infrared astronomy4
- optical astronomy4
- photometry4
- quasars4
- spectroscopy4
- ultraviolet astronomy4
- variability4
- x-ray4
- x-ray astronomy4
- galatic evolution3
- star formation2
- supernovae2
- surveys2
- cosmology1
- dark matter1
- extra-galactic stars1