# Cambridge study on comet theory of life origins > Developing situation record from CLSTR: https://clstr.news/situations/cambridge-study-on-comet-theory-of-life-origins > Updated: 2026-10-31T19:53:05.000Z. Sources: 42. Developments: 3. Researchers at the University of Cambridge, led by Dr. Richard Anslow of the Institute of Astronomy, have published a study in Scientific Reports that challenges the theory that comets delivered essential organic molecules to early Earth. Using computer simulations of 100,000 comet impact scenarios, the study suggests that comets typically enter the atmosphere at speeds and angles that would vaporize fragile prebiotic molecules, such as hydrogen cyanide, upon impact. The research concludes that while comets contain necessary carbon- and nitrogen-containing molecules, the successful delivery of these materials would be a “one-in-a-million” occurrence or a “one-off fluke” rather than a consistent process. Focusing on the panspermia hypothesis, which proposes that organic molecules were transported to Earth via cosmic bodies, the simulations specifically examined hydrogen cyanide due to its role in synthesizing lipids, sugars, and nucleotides. Anslow described the long-standing notion of comets acting as cosmic delivery systems as “a romantic idea” that is ultimately “very unlikely” according to the new modeling results. New data from the simulations indicates that in 54 percent of the scenarios, no successful delivery occurred. Even in the rare instances where delivery was successful, researchers noted that concentrations were likely insufficient to trigger prebiotic chemistry. While the findings cast doubt on the role of comets for Earth, researchers noted that conditions on Mars might have been more favorable for such delivery due to its smaller size and thinner atmosphere. The research suggests that the chemical precursors to life may have instead originated through asteroid impacts or internal terrestrial processes. ## Claims - Computer simulations suggest comets were unlikely to have delivered the organic molecules needed to start life on Earth. (reported by 3 sources) - Fragile organic molecules would likely be destroyed or vaporized by the speed and angle of cometary impacts. (reported by 3 sources) - The study specifically focused on the prebiotic molecule hydrogen cyanide (HCN). (reported by 1 source) - Comet impacts on Earth declined rapidly during the planet's first 500 million years. (reported by 1 source) - Mars may have had better conditions for cometary delivery due to its smaller size and thinner atmosphere. (reported by 1 source) ## Timeline ### 2026-10-31: New research challenges theories on comet-driven life origins and colorectal cancer patterns New studies suggest comets may have destroyed organic molecules during impacts rather than seeding life, and reveal cellular differences making colorectal cancer more aggressive in younger patients. 2 sources. https://clstr.news/cluster/new-research-challenges-theories-on-comet-driven-life-origins-and-colorectal-cancer-patterns ### 2026-10-30: University of Cambridge study challenges theory of comets seeding life on Earth A University of Cambridge study suggests comets likely did not deliver the building blocks of life to Earth, as high-speed impacts would have destroyed fragile organic molecules. 21 sources. https://clstr.news/cluster/university-of-cambridge-study-challenges-comet-theory-for-origin-of-life ### 2026-10-28: University of Cambridge study challenges comet theory of life's origin A University of Cambridge study using 100,000 simulations suggests comets likely did not deliver the organic molecules necessary for life on Earth due to extreme impact conditions. 19 sources. https://clstr.news/cluster/cambridge-study-challenges-theory-of-comets-delivering-lifes-building-blocks --- Cite as: Cambridge study on comet theory of life origins. CLSTR, https://clstr.news/situations/cambridge-study-on-comet-theory-of-life-origins