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3. Carl Sagan's subj

Alternative clues for the word astr

• Dark matter sci
• Sagan's specialty: Abbr.
• Sci. of Copernicus
• NASA sci
• Palomar sci
• Subj. for Neil deGrasse Tyson
• Galaxy sci
• Sci. of stars, etc
• One of the hard sciences: Abbr
• Subj. for starry-eyed students