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3. Sagan's subj

Alternative clues for the word astr

• Copernicus's field: Abbr.
• One of the hard sciences: Abbr.
• Halley's sci
• Subj. for starry-eyed students
• Star sci
• Sagan's specialty (Abbr.)
• NASA subj.
• Study of the heavens: Abbr.
• Man with a telescope: Abbr
• Sci. branch