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Research on early Earth life emergence conditions
Overview
Researchers using three-dimensional computational models have identified a potential window for the emergence of life on early Earth. The studies, published in Nature Communications, suggest that approximately 4.33 billion years ago, the frequency of sterilizing impacts from asteroids, comets, and planetary debris declined sufficiently to allow for stable conditions.
Prior to this period, heavy bombardment created an inhospitable environment through intense heat. As impacts became less disruptive, portions of the shallow crust cooled and stabilized. These stable regions may have supported the ‘RNA world’ stage, a period where RNA molecules could facilitate chemical reactions before the emergence of DNA. While large impacts could destroy fragile molecules, the research notes that collisions also helped create hydrothermal systems providing essential water, warmth, and chemical energy.
Entities
Nature Communications · Caltech · Oleg Abramov · Planetary Science Institute
Timeline
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[TECHNOLOGY] 2 sourcesEarth's early history: Scientists identify potential window for life's emergence
Scientists have identified a potential window 4.33 billion years ago when Earth became stable enough for early life chemistry, while new research challenges interpretations of ancient carbon isotope signals.
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[TECHNOLOGY] 3 sourcesPlanetary Science Institute study pinpoints when early Earth became ready for life
A new study using 3D computer modeling suggests Earth became stable enough to support life-essential chemistry, such as the ‘RNA world,’ approximately 4.33 billion years ago.
Sources
astrobiology.com · enikos.gr · knowridge.com · stoxos.gr · thebrighterside.news