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Subject
- surveys6
- active-galactic-nuclei3
- spectroscopy3
- astrophotography2
- history-of-astronomy2
- active-galaxies1
- broad-band-photometry1
- digital images1
- galaxy-clusters1
- galaxy-planes1
- milky-way-galaxy1
- objective prism1
- radio continuum: general, techniques: image processing1
- survey1
- variable-stars1
- virtual observatory1
- virtual-observatories1
- x-ray-astronomy1