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Subject
- h-alpha-photometry1
- h-beta-photometry1
- history-of-astronomy1
- infrared-photometry1
- interstellar-line-emission1
- interstellar-medium1
- magellanic-clouds1
- objective prism1
- observational-cosmology1
- post-asymptotic-giant-branch-stars1
- proper-motions1
- quasars1
- radio-galaxies1
- spectropolarimetry1
- stellar-atmospheres1
- strong-gravitational-lensing1
- theoretical-models1
- variable-stars1
- x-ray-sources1