Results 131 to 140 of about 5,203 (251)

Exobiology and the search for biological signatures on Mars [PDF]

open access: yes
In preparation for a Mars Rover/Sample return mission, the mission goals and objectives must be identified. One of the most important objectives must address exobiology and the question of the possibility of the origin and evolution of life on Mars.
Mancinelli, Rocco L.   +1 more
core   +1 more source

Giant planets: Clues on current and past organic chemistry in the outer solar system [PDF]

open access: yes
The giant planets of the outer solar system - Jupiter, Saturn, Uranus, and Neptune - were formed in the same flattened disk of gas and dust, the solar nebula, as the terrestrial planets were.
Atreya, Sushil K., Pollack, James B.
core   +1 more source

CRAF Mission: An opportunity for exobiology [PDF]

open access: yes
The Halley missions of 1986 gave us a first, quick glimpse of a comet nucleus and the first in situ measurements of cometary gas and dust. Many of our basic ideas about cometary nuclei were confirmed while a number of startling new discoveries were also ...
Neugebauer, Marcia, Weissman, Paul
core   +1 more source

Pyruvate Aldol Condensation Product: A Metabolite That Escaped Synthetic Preparation for Over a Century

open access: yesACS Omega, 2020
Andro C. Rios   +3 more
doaj   +1 more source

Ethical considerations for the age of non-governmental space exploration

open access: yesNature Communications
Mounting ambitions and capabilities for public and private, non-government sector crewed space exploration bring with them an increasingly diverse set of space travelers, raising new and nontrivial ethical, legal, and medical policy and practice concerns
Allen Seylani   +20 more
doaj   +1 more source

Aerospace medicine and biology: A continuing bibliography with indexes (supplement 297) [PDF]

open access: yes
This bibliography lists 89 reports, articles and other documents introduced into the NASA scientific and technical information system in April ...

core   +1 more source

LIQUID WATER AND ORGANICS IN COMETS: IMPLICATIONS FOR EXOBIOLOGY [PDF]

open access: green, 2015
J. T. Wickramasinghe   +2 more
openalex   +1 more source

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