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Subject
- astronomy-web-services1
- disk-galaxies1
- dwarf-elliptical-galaxies1
- early-type-galaxies1
- galaxy-clusters1
- galaxy-colors1
- globular-star-clusters1
- interstellar-medium1
- magellanic-clouds1
- observational-cosmology1
- perseus-cluster1
- proper-motions1
- quasars1
- redshift-surveys1
- strong-gravitational-lensing1
- virtual-observatories1
- x-ray-astronomy1
- x-ray-sources1