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Subject
- space observatories[remove]15
- observational astronomy13
- photometry6
- ccd photometry4
- radio astronomy3
- radio sources3
- variable stars3
- correlation2
- infrared photometry2
- late-type stars2
- magnetic fields2
- radio absorption2
- radio antennas2
- radio astrometry2
- radio interferometers2
- radio interferometry2
- radio observatories2
- radio spectra2
- radio spectrographs2
- radio spectrometers2
