| The demon-haunted world: Science as a candle in the dark C Sagan Ballantine books, 2011 | 2659 | 2011 |
| The demon-haunted world: Science as a candle in the dark C Sagan Ballantine books, 2011 | 2659 | 2011 |
| Cosmos C Sagan Edicions Universitat Barcelona, 2006 | 2328 | 2006 |
| Dragons of Eden: Speculations on the evolution of human intelligence C Sagan Ballantine Books, 2012 | 1675 | 2012 |
| Endogenous production, exogenous delivery and impact-shock synthesis of organic molecules: an inventory for the origins of life C Chyba, C Sagan Nature 355 (6356), 125-132, 1992 | 1537 | 1992 |
| Pale blue dot: A vision of the human future in space C Sagan, A Druyan Ballantine books, 2011 | 1194 | 2011 |
| Nuclear winter: Global consequences of multiple nuclear explosions RP Turco, OB Toon, TP Ackerman, JB Pollack, C Sagan Science 222 (4630), 1283-1292, 1983 | 1160 | 1983 |
| Earth and Mars: Evolution of atmospheres and surface temperatures C Sagan, G Mullen Science 177 (4043), 52-56, 1972 | 1075 | 1972 |
| A new look at the Saturn system: The Voyager 2 images BA Smith, L Soderblom, R Batson, P Bridges, JAY Inge, H Masursky, ... Science 215 (4532), 504-537, 1982 | 976 | 1982 |
| Encounter with Saturn: Voyager 1 imaging science results BA Smith, L Soderblom, R Beebe, J Boyce, G Briggs, A Bunker, ... Science 212 (4491), 163-191, 1981 | 895 | 1981 |
| The Jupiter system through the eyes of Voyager 1 BA Smith, LA Soderblom, TV Johnson, AP Ingersoll, SA Collins, ... Science 204 (4396), 951-972, 1979 | 805 | 1979 |
| Intelligent life in the universe IS Shklovsky, C Sagan New York: Delta, 1966 | 779 | 1966 |
| Cometary delivery of organic molecules to the early Earth CF Chyba, PJ Thomas, L Brookshaw, C Sagan Science 249 (4967), 366-373, 1990 | 739 | 1990 |
| Optical constants of organic tholins produced in a simulated Titanian atmosphere: From soft X-ray to microwave frequencies BN Khare, C Sagan, ET Arakawa, F Suits, TA Callcott, MW Williams Icarus 60 (1), 127-137, 1984 | 727 | 1984 |
| Broca's brain: Reflections on the romance of science C Sagan Ballantine Books, 1986 | 609 | 1986 |
| Carl Sagan's cosmic connection: An extraterrestrial perspective C Sagan Cambridge University Press, 2000 | 563 | 2000 |
| The Galilean satellites and Jupiter: Voyager 2 imaging science results BA Smith, LA Soderblom, R Beebe, J Boyce, G Briggs, M Carr, SA Collins, ... Science 206 (4421), 927-950, 1979 | 543 | 1979 |
| A search for life on Earth from the Galileo spacecraft C Sagan, WR Thompson, R Carlson, D Gurnett, C Hord Nature 365 (6448), 715-721, 1993 | 490 | 1993 |
| The early faint sun paradox: Organic shielding of ultraviolet-labile greenhouse gases C Sagan, C Chyba Science 276 (5316), 1217-1221, 1997 | 458 | 1997 |
| Physical properties of the particles composing the Martian dust storm of 1971–1972 OB Toon, JB Pollack, C Sagan Icarus 30 (4), 663-696, 1977 | 457 | 1977 |
