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Subject
- x-ray sources[remove]63
- surveys11
- galaxy clusters10
- pre-main sequence stars7
- open star clusters6
- quasars6
- galaxies5
- active galactic nuclei4
- magellanic clouds4
- redshifted / redshift4
- astronomical object identification3
- catalogs3
- photometry3
- apparent magnitude2
- giant stars2
- infrared sources2
- radial velocity2
- radio astronomy2
- radio sources2
- ultraviolet sources2