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- A
- Alpha Centauri
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- An
- Andromeda Galaxy
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- ArXiv
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- Catholic
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- Distance measures
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- Drives
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- Earth
- Earth's orbit
- Eberly
- Eberly College of Science
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- HD 154857
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- International Standard Book Number
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- Mu Arae
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- Nebula
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- NGC 6215
- NGC 6221
- NGC 6397
- Night Sky
- North America Nebula
- Number
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- Orion Nebula
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- Over
- Parker Solar
- Parker solar probe
- PARSEC
- Phobos
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- Pro
- Proveis
- Proxima Centauri
- Proxima Centauri b
- Putting
- Radian
- R Doradus
- Red spot
- Result
- Rho Cassiopeiae
- Rho Ophiuchi cloud complex
- Right ascension
- Saturn
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- Second
- Shen Kuo
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- Small-angle approximation
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- TheFreeDictionary.com
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- Universe
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- Vision Sciences Inc.
- Visual acuity
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- What
- Wikipedia
- Wikisource
- Zeta Ophiuchi