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#carl sagan
#cosmos
#carl sagan day
#happy birthday carl sagan
#popular science
#popsci
#popular science magazine
#astronomy
#science
#universe
#science side of tumblr
#science side
#throwback thursday
#archives
#vintage
#carl sagan
#carl sagan day
#cosmos
#picture
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#sci-lit
#scientific literacy
#education
#astronomy
#astrophysics
#pale blue dot
#earth
#cassini
#saturn
#nasa
#jpl
#space
#spacecraft
#space exploration
#carl sagan
#carl sagan day
#sagansense
#science
#sci-lit
#scientific literacy
#education
#astronomy
#astrophysics
#pale blue dot
#earth
#cassini
#saturn
#nasa
#jpl
#space
#spacecraft
#space exploration
#carl sagan
#carl sagan day
#sagansense
#carl sagan
#carl sagan day
#science fuck yeah
#hypothesis
#hail sagan
#carl sagan day
#science fuck yeah
#hypothesis
#hail sagan
#carl sagan day
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