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Alternative clues for the word astr

• Subj. for Carl Sagan
• Copernicus's sci
• Study of the heavens: Abbr.
• Tycho Brahe's sci.
• Copernicus's field: Abbr.
• Coll. major involving an observatory
• Galileo was one: Abbr.
• Study of the stars: Abbr.
• Sagan's sci
• Star sci