1. (astronomy) an observational branch of astronomy, which deals with the study of X-ray emission

Encyclopedia: X-ray astronomy

• Stuart Davis
• stub
• stub nail
• stub out
• stubbiness
• stubble
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• stubborn
• stubbornly
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• Stubbs
• stubby
• stucco
• stuck
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• stud
• stud farm
• stud finder
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• studbook
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• studdingsail