Overview
- Japanese researchers report in Nature Astronomy the detection of adenine, guanine, cytosine, thymine and uracil in pristine material returned by JAXA’s Hayabusa2 mission.
- Comparisons with Bennu and meteorites show differing purine–pyrimidine balances, with a newly identified correlation between those ratios and ammonia concentrations.
- The study strengthens the case that carbonaceous asteroids supplied prebiotic organic molecules to early Earth without indicating life existed on Ryugu.
- Two carefully curated Ryugu samples totaling 5.4 grams were collected in space and analyzed under ultra-clean procedures to guard against terrestrial contamination.
- The findings corroborate 2025 results from NASA’s Bennu samples that also contained all five nucleobases, expanding evidence for widespread prebiotic chemistry in the Solar System.