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3. Heavens: Prefix

Alternative clues for the word astr

• Subj. studied by Neil deGrasse Tyson
• Sagan's specialty (Abbr.)
• Neil deGrasse Tyson subj
• Copernicus's field: Abbr.
• Study of the heavens: Abbr.
• One of the hard sciences: Abbr.
• Carl Sagan's subj
• Star: Comb. form
• Galaxy sci.
• Celestial prefix