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Carl Sagan with a model of the Viking Lander in Death Valley California. Viking 1 and II were the first spacecraft to search for present day life on Mars.

Featured articles on astrobiology:

• Astrobiology
• Abiogenesis - about natural process of how life arises from non living matter
• Panspermia - transfer of life between planets on meteorites.
• Terrestrial analogue sites
• Murchison meteorite

Life on Mars:

• Possible Present Day Habitats For Life On Mars
• Life on Mars
• Present day Mars habitability analogue environments on Earth
• Viking program
• Allan Hills 84001 - the meteorite with tiney structures resembling cells

Life elsewhere

• Hypothetical types of biochemistry
• Life on Titan
• Life on Venus

Planetary protection:

• Planetary protection
• Interplanetary contamination
• Planetary protection for a Mars sample return

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Astrobiology

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This encyclopedia is based on the astrobiology articles in Wikipedia. For the reasons for making them into a new separate encyclopedia, see: Astrobiology:Background to this encyclopedia