New research published this week in *Proceedings of the National Academy of Sciences* offers compelling evidence supporting the “RNA world” hypothesis-a leading theory about the origins of life on Earth. scientists have long believed RNA, a molecule simpler than DNA, may have been the key genetic component in early life forms. A team at Tohoku University has now demonstrated, for the first time, the spontaneous formation of RNA in laboratory conditions mimicking early Earth, possibly resolving a major challenge in understanding how life first arose [[1]]. The findings, coupled with the finding of RNA building blocks on the asteroid Bennu, suggest a possible extraterrestrial contribution to life’s beginnings.
Scientists are gaining crucial insights into the origins of life on Earth, with new research bolstering the long-standing “RNA world” hypothesis. This theory posits that RNA, or ribonucleic acid, predated DNA and played a pivotal role in the initial stages of evolution.
A study published December 15, 2025, in the journal Proceedings of the National Academy of Sciences suggests that a massive impact event in Earth’s early history may have delivered the building blocks of RNA to the planet’s surface. Under specific conditions, particularly with the presence of a compound called borate, these chemical components could have rapidly reacted to form RNA naturally. The emergence of life is a fundamental question in science, and understanding the conditions that allowed it to arise is a key focus of ongoing research.
RNA is considered essential in biological systems due to its role in protein synthesis. While simpler than DNA, it possesses the ability to carry genetic information and catalyze the formation of other molecules. This simplicity leads many researchers to believe RNA was a primary player in the emergence of the first living cells approximately 4.3 billion years ago.
Despite the long-held RNA world hypothesis, demonstrating the chemical processes that would have allowed RNA to form without human intervention has proven challenging. The spontaneous creation of such a complex molecule was considered highly improbable, prompting scientists to seek more geologically plausible reaction pathways.
A team of biochemists led by Yuta Hirakawa at Tohoku University in Japan conducted laboratory experiments, combining ribose, phosphate, and the four RNA nucleobases—adenine, guanine, cytosine, and uracil—with borate and basalt rock in a simulated early Earth environment. The mixture was then heated and dried to mimic conditions found around subterranean aquifers.
The experimental approach yielded surprising results. For the first time, RNA was successfully formed in the lab without direct human intervention triggering the reaction. “The results showed that RNA successfully formed in the mixture. Borate did not inhibit the reaction at all, and even helped several stages in the DSM model, such as stabilizing the usually unstable ribose molecule and facilitating phosphate production,” the research report stated, according to Space on January 5, 2026.
Further supporting the hypothesis, analysis of samples from asteroid Bennu, brought to Earth by NASA’s OSIRIS-REx mission, revealed the presence of ribose. This discovery adds to the growing list of RNA building blocks now identified in asteroid material.
Researchers theorize that a protoplanet impact—approximately 500 kilometers in diameter and rich in organic material—may have delivered a substantial amount of RNA components to Earth. This event is estimated to have occurred 200 million years after Earth’s formation and well before the oldest evidence of life found in 4.1 billion-year-old zircon minerals.
While RNA itself isn’t considered life, its rapid formation in early Earth conditions could have provided a crucial stepping stone toward the emergence of the first simple organisms. Furthermore, given that large asteroid impacts also occurred in the early history of Mars and borate has been detected there, a similar scenario may have unfolded on the Red Planet.
