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3. Sagan's subj

Alternative clues for the word astr

• Heavenly field?: Abbr.
• Space science: Abbr.
• Observatory subj.
• One of the hard sciences: Abbr.
• Man with a telescope: Abbr
• Subj. for Carl Sagan
• "Cosmos" subj
• Carl Sagan's sci
• Stellar start?
• NASA subj