Scientists find sugar molecules in space

Izaskun Jiménez-Serra and colleagues reported in July that they had detected a sugar molecule in interstellar space for the first time, adding a new data point to research on prebiotic chemistry beyond Earth. The molecule is erythrulose, a four-carbon sugar identified in the molecular cloud G+0.693−0.027 near the center of the Milky Way. The result was published in *Nature Astronomy* after first appearing as a preprint in June. NASA-linked astrobiology accounts recirculated the finding on September 1, bringing the paper back into wider view. ### Which sugar did scientists actually find? Erythrulose is the molecule the team identified, not ribose or glucose. The paper describes it as a chiral four-carbon ketose, and Nature called it the first “true sugar” found in space. The interstellar cloud was G+0.693−0.027, a chemically rich region near the Galactic Center. (nature.com) According to the study and follow-up coverage, the team used an ultrasensitive broadband millimeter spectral survey to identify the molecule’s signature there. ### Why is this being described as a first? The study says sugars such as ribose and glucose had previously been found in meteorites and asteroid samples, but no sugar had been directly detected in the interstellar medium before this work. (nature.com) That distinction matters because meteorites and asteroids preserve material that has already been processed inside Solar System bodies, while interstellar clouds represent chemistry in the gas-and-dust environments that exist before planets form. ACS and Nature both framed the detection as the first confirmed sugar in interstellar molecular clouds. ACS said astronomers had previously identified many molecules linked to prebiotic chemistry, but not a true sugar. ### Does this mean scientists found the origin of life? (arxiv.org) The paper does not say that. The authors say the detection supports the idea that biologically relevant organic chemistry can arise in interstellar environments, and their modeling suggests erythrulose can form efficiently on dust grains. Nature and Phys.org reported that sugars found in meteorites and asteroids had already led researchers to consider whether some of Earth’s prebiotic ingredients may have had an extraterrestrial source. (cen.acs.org) This new result strengthens that line of inquiry, but it does not show that erythrulose itself seeded life on Earth, nor does it prove that interstellar sugars were delivered here in amounts that mattered biologically. (nature.com) That connection remains a hypothesis discussed in origin-of-life research. ### Why are scientists interested in a four-carbon sugar? Four carbon atoms make erythrulose simpler than ribose, the five-carbon sugar associated with RNA, but still chemically important. The researchers and outside coverage describe sugars as central biomolecules because they function in metabolism and in the backbone chemistry of nucleic acids. (nature.com) Phys.org reported that the team did not detect comparable three-carbon sugars in the same region and that erythrulose appeared at least eight times more abundant than those analogs. That unexpected pattern matters because it suggests the chemistry may not proceed in the stepwise way some astrochemists had assumed. (arxiv.org) ### What happens next? The July paper gives astronomers a specific target for follow-up searches: more sugars, in more clouds, with better constraints on how they form. The study’s authors paired the detection with quantum-chemical and astrochemical simulations, and future work is likely to test whether similar molecules appear in other molecule-rich regions near the Galactic Center or elsewhere. (astrobiology.com) The September 1 social post points readers back to an already published result rather than announcing a new discovery date. For the primary source, the next stop is the *Nature Astronomy* paper by Jiménez-Serra and co-authors, published in July 2026. (nature.com)