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Subject
- metal poor stars1
- milky way galaxy1
- minor planets1
- near earth asteroids1
- optical observations1
- optical telescopes1
- quasars1
- small magellanic cloud1
- solar system1
- sources1
- space vehicles1
- spectrum1
- star-forming regions1
- survey with schmidt telescope1
- ultraviolet-excess galaxies1
- x ray astronomy1
- x ray observatories1