All five DNA and RNA nucleobases found in asteroid Ryugu samples

· Science · Japan

Scientists have identified all five nucleobases used by DNA and RNA in pristine samples returned from asteroid Ryugu, according to a ScienceDaily report. The find suggests that the molecular ingredients of life existed in space billions of years ago and were widespread across the early solar system. It adds to growing evidence from other asteroids and meteorites that these compounds form and persist off Earth, strengthening the case that asteroid and comet delivery could have seeded the prebiotic chemistry from which life emerged. The result rests on uncontaminated material collected directly from the asteroid's surface, which makes it harder to attribute the molecules to terrestrial contamination. The report gives no further details on the concentrations measured or which research team conducted the analysis; publication in a peer-reviewed journal is implied but not stated.

Why it matters：If the building blocks of nucleic acids are common on asteroids, the origin of life may depend less on rare local chemistry and more on delivery events — a shift that shapes how astrobiology missions and sample-return programs are prioritized.

Key points

  • The find covers all five nucleobases used in DNA and RNA, not just a subset.
  • Samples came from asteroid Ryugu and were described as pristine.
  • It adds to earlier detections in other asteroids and meteorites.

Sources (original reporting)

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