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3. Kepler's subj

Alternative clues for the word astr

• Sagan's specialty (Abbr.)
• One of the hard sciences: Abbr.
• Sci. for Kepler
• Carl Sagan's subj
• Galileo was one: Abbr.
• Galaxy sci
• NASA subj
• Sci. of stars, etc
• Sci. subject
• Space: Prefix