Researchers using Spanish radio telescopes have identified erythrulose, a four-carbon sugar, within an enormous dust and gas cloud designated G+0.693-0.027 located near the galactic center. The discovery marks the first direct detection of a simple sugar in the interstellar medium, the vast expanse between stars. Erythrulose occurs naturally in raspberries and is used commercially in self-tanning products.
The compound appears to form through chemical reactions occurring on microscopic dust grains despite extreme temperatures around -250 degrees Celsius. Scientists determined that erythrulose develops when two other organic compounds—glycolaldehyde and ethylene glycol—combine on these dust particles. The findings, published in Nature Astronomy, demonstrate that sugars previously thought difficult to produce naturally may be far more prevalent throughout the cosmos than anticipated.
The detection carries implications for understanding life’s origins. Simple sugars like erythrulose provide energy for living organisms and can interact to form ribonucleotides, fundamental components of RNA, which scientists believe served as early genetic material before the evolution of DNA. Researchers propose that during Earth’s early history, particularly during a period of intense asteroid and comet impacts, vast quantities of such organic compounds could have descended onto the planet.
Scientists previously struggled to explain how simple sugars became abundant on the young Earth, as laboratory conditions do not favor their natural formation. Earlier discoveries of sugars in ancient meteorites and on the Bennu asteroid suggested extraterrestrial origins, but direct interstellar detection had eluded researchers until now. The new findings strengthen the hypothesis that organic compounds synthesized in space may have contributed to prebiotic chemical environments where the first biomolecules necessary for life emerged.
Experts view the results as confirmation of long-standing theoretical expectations. The research indicates that delivery mechanisms for life’s chemical building blocks through space may have played a crucial role in facilitating the emergence of life on Earth and potentially on other planets with suitable conditions.
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