"It is possible that life on earth arrived from a asteroid that contained small bacteria or something similar?"
Now showing: Year 2008 projects that addressed Astrobiology Roadmap Objective 7.1 from the CAL team
Roadmap Goal 7: Determine how to recognize signatures of life on other worlds and on early Earth
Objective 7.1: Biosignatures to be sought in Solar System materials
Climate, Habitability, and the Atmosphere on early Mars
Iron and sulfur-based biospheres and their biosignatures
Isotopic fingerprints of past life and surface conditions on Mars
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