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Subject
- photometry8,401
- optical astronomy4,789
- galaxies4,290
- infrared photometry3,704
- spectroscopy3,142
- surveys2,348
- radial velocity2,258
- wide-band photometry2,081
- radio astronomy1,939
- chemical abundances1,793
- variable stars1,687
- redshifted1,646
- multiple stars1,457
- x-ray sources1,419
- open star clusters1,404
- infrared astronomy1,302
- infrared sources1,236
- galaxy clusters1,209
- radio sources1,086
- quasars1,079