NGC 2158
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Robert Julius Trumpler
Trumpler (lunar crater)
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List of craters on the Moon: T–Z
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Trumpler
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Extinction (astronomy)
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Messier 52
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Messier 37
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Boris Vorontsov-Velyaminov
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Robert J. Trumpler Award
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Astronomical Society of the Pacific
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Philibert Jacques Melotte
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Orion Nebula
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List of astronomers
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Timeline of knowledge about the interstellar and intergalactic medium
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Open cluster
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Galaxy
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Robert Trumpler
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Robert J. Trumpler
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