Modern science continues to uncover evidence that the history of life on Earth is inextricably linked to events occurring in the distant cosmos. According to a new study published in the prestigious The Astrophysical Journal Letters, a supernova explosion that occurred approximately 2.5 million years ago could have been the catalyst for massive evolutionary changes on our planet. Scientists from the University of California, Santa Cruz, propose a hypothesis that the flux of cosmic rays from this cosmic cataclysm not only reached Earth but also significantly influenced biological life, acting as a powerful mutagen.
From Voting Glitches to DNA Mutations
Researchers' interest in the impact of cosmic rays on terrestrial processes often begins with local but illustrative incidents. A striking example is the 2003 incident in Belgium, where a critical failure occurred during an electronic vote. The error, which led to the incorrect tallying of votes, was caused by a bit flip in the memory system, triggered by the impact of a high-energy cosmic particle. This event vividly demonstrated how elements from deep space can influence complex technological systems.
Realizing this vulnerability prompted scientists to ask a broader question: if cosmic radiation can break electronics in fractions of a second, how did it influence biological life and its evolutionary paths over millions of years? Researchers hypothesized that intense irradiation could damage the DNA of living organisms, accelerating mutation processes and, consequently, evolution.
Iron-60: The "Fingerprint" of an Ancient Explosion
The key physical evidence for the existence of this ancient cosmic event was the discovery of a specific isotope — iron-60 — in ocean floor sediments. This radioactive element is a byproduct of supernova explosions and is not produced in natural terrestrial processes in such quantities. Analysis of geological layers showed a clear peak in iron-60 concentration, dated to approximately 2.5 million years ago. This indicates that a powerful stellar explosion occurred near the Solar System at that time, the remnants of which reached Earth.
Lake Tanganyika: An Evolutionary Laboratory
In search of biological confirmation of their hypothesis, astrophysicists turned to studies of ancient water bodies that preserved traces of past life. Special attention was paid to Lake Tanganyika in Africa. The age of this lake is estimated at 9 to 12 million years, and it is one of the most biodiverse places on the planet. Biological data obtained from studying the lake's sedimentary rocks indicate that a rapid surge in new species occurred there exactly 2.5 million years ago.
Specifically, an explosive species diversification was observed among cichlid fish, as well as accelerated recombination of viruses associated with them. This sharp acceleration of evolutionary processes coincides in time with the presumed period of exposure to cosmic rays from the supernova.
Cosmic Mutagen and Evolutionary Leap
The coincidence of the timeframe between the discovery of the iron-60 isotope and the surge in biodiversity in Lake Tanganyika supports the theory that cosmic radiation could have served as a natural mutagen. High radiation likely damaged the DNA of organisms, forcing them to adapt and mutate faster, leading to the emergence of new species. Thus, a catastrophic event in space could have become an engine of life, triggering a rapid evolutionary leap that determined the modern appearance of fauna in certain regions of Earth.
Contradictory Data
Despite the persuasiveness of the correlation between cosmic events and biological changes, scientists emphasize that further thorough research is necessary to finally confirm a direct causal link. At present, the hypothesis that the supernova was the *sole* or *main* cause of speciation in Tanganyika remains a subject of debate. Some experts point out that evolutionary leaps could have been caused by climatic changes of that period, which do not always correlate with cosmic factors. Nevertheless, the discovery of iron-60 makes the version of supernova influence one of the most probable in modern science.
