Bennu’s sugars sharpen the question of where life’s ingredients formed

A study published December 2, 2025, identified ribose and glucose in samples returned from asteroid Bennu. The discovery expanded the known inventory of life’s ingredients in the material: ribose supplies part of RNA’s structure, while glucose fuels cells on Earth. The findings concerned chemistry that could precede biology, not evidence of organisms. ^[1]

Meteorites face uncontrolled Earth exposure before collection. By contrast, OSIRIS-REx returned its Bennu sample to Earth on September 24, 2023, after which it was kept under high-purity nitrogen. That controlled history strengthens the basis for examining whether the molecules formed beyond Earth. ^[2]

Researchers analysed 603.4 milligrams of powdered sample, separated the compounds and checked their mass signatures. A second instrument and separation column confirmed six sugars. A silica control processed alongside the material contained none, supporting the authors’ conclusion that the analytical procedure had not introduced them. ^[2]

Ribose’s significance lies in the larger inventory. Earlier analyses had already identified nucleobases and phosphate in Bennu samples; adding ribose supplied the remaining type of component needed for RNA. That is relevant to the RNA-world hypothesis, in which RNA could both carry information and drive reactions before today’s DNA-and-protein system developed. Detecting components does not establish that an RNA molecule assembled there. ^[1]

The authors propose that reactions involving formaldehyde in watery conditions inside Bennu’s parent asteroid produced the sugars. The laboratory and mineral evidence supports that explanation; the specific reaction mechanisms and conditions remain subjects for further investigation. ^[2]

Small quantities and interfering compounds prevented measurements of the sugars’ stable isotopes and molecular handedness. Deoxyribose, the sugar used in DNA, was below detection limits. That finding does not demonstrate that it was never present. ^[2]

For origin-of-life research, the contribution is a better inventory of material that asteroids could have supplied to early Earth. The gap between available ingredients and a functioning biological system remains: the discovery supports a possible supply route, rather than demonstrating how life began. ^[1]

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