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Subject
- observational-cosmology1
- perseus-cluster1
- post-asymptotic-giant-branch-stars2
- proper-motions1
- quasars1
- radio-galaxies2
- redshift-surveys1
- spectropolarimetry2
- spectroscopy15
- stars4
- stellar-atmospheres2
- strong-gravitational-lensing1
- surveys9
- time-domain-astronomy2
- variable-stars2
- virtual-observatories1
- x-ray-astronomy1
- x-ray-sources1