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Endogenous production, exogenous delivery and impact-shock synthesis of organic molecules: an inventory for the origins of life
TLDR
Earth and Mars: Evolution of Atmospheres and Surface Temperatures
Solar evolution implies, for contemporary albedos and atmospheric composition, global mean temperatures below the freezing point of seawater less than 2.3 aeons ago, contrary to geologic and…
Optical constants of organic tholins produced in a simulated Titanian atmosphere: From soft x-ray to microwave frequencies
- B. Khare, C. Sagan, E. Arakawa, F. Suits, T. A. Callcott, M. W. Williams
- Physics
- 1 October 1984
A search for life on Earth from the Galileo spacecraft
- C. Sagan, W. R. Thompson, R. Carlson, D. Gurnett, C. Hord
- PhysicsNature
- 21 October 1993
In its December 1990 fly-by of Earth, the Galileo spacecraft found evidence of abundant gaseous oxygen, a widely distributed surface pigment with a sharp absorption edge in the red part of the…
Cometary delivery of organic molecules to the early Earth.
- C. Chyba, P. Thomas, L. Brookshaw, C. Sagan
- Physics, GeologyScience
- 27 July 1990
TLDR
Physical properties of the particles composing the Martian dust storm of 1971–1972
- O. Toon, J. Pollack, C. Sagan
- Geology
- 1 April 1977
Voyager 2 at Neptune: Imaging Science Results
- B. Smith, L. Soderblom, J. Veverka
- Physics, Environmental ScienceScience
- 15 December 1989
Voyager 2 images of Neptune reveal a windy planet characterized by bright clouds of methane ice suspended in an exceptionally clear atmosphere above a lower deck of hydrogen sulfide or ammonia ices.…
The early faint sun paradox: organic shielding of ultraviolet-labile greenhouse gases
TLDR
Encounter with saturn: voyager 1 imaging science results.
- B. Smith, L. Soderblom, V. Suomi
- PhysicsScience
- 10 April 1981
TLDR
Ultraviolet selection pressure on the earliest organisms.
- C. Sagan
- PhysicsJournal of theoretical biology
- 1 April 1973
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