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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. I used to work in Wikipedia but have recently been blocked for editing it, in part for adding an article on Possible Present Day Habitats For Life On Mars!

If anyone else wants to join in working on this material - then as a small wiki then we can be a friendlier place here. Your work and expertise will be respected and anyone who wants to help fix things, especially if you are knowledgeable about astrobiology, then you are very welcome indeed.

In topics where there is a wide range of views, such as planetary protection, or the habitability of present day Mars, the aim is to present all the views on the topic. However, unlike Wikipedia, we can also have separate blogs where editors present opinions, original research and so on. I haven't yet worked out how to do that.

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