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Alternative clues for the word astr

• Stellar start?
• Sagan's subj
• Subj. for Neil deGrasse Tyson
• Subj. for Carl Sagan
• Subj. studied by Neil deGrasse Tyson
• Sci. of Copernicus
• College sci. class
• Solar system sci
• NASA sci
• One of the hard sciences: Abbr.