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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 tiny 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 astrobiology articles imported from Wikipedia. Especially if you are knowledgeable about astrobiology, you are very welcome to help edit it.

The aim is to present the full range of expert views on any topic, such as planetary protection, or habitability of present day Mars. However, unlike Wikipedia, we can also have separate blogs where editors present opinions, original research and so on. Details to be worked out.

For the reason for setting up a new encyclopedia for this content, instead of fixing it in Wikipedia itself, see background to this encyclopedia.