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Subject
- observational astronomy[remove]49
- space observatories13
- ultraviolet astronomy9
- x-ray sources9
- spectroscopy8
- photometry6
- ccd photometry4
- radio astronomy4
- radio sources4
- variable stars4
- infrared astronomy3
- infrared photometry2
- infrared sources2
- late-type stars2
- magnetic fields2
- optical observation2
- quasars2
- radial velocity2
- redshifted / redshift2
- surveys2
