A team of Japanese scientists identified the complete set of primary genetic components inside pristine samples returned from asteroid Ryugu. To avoid any terrestrial contamination, researchers handled the specimens under ultra-clean conditions and extracted the organic molecules using water and hydrochloric acid. The analysis revealed roughly equal amounts of adenine, guanine, cytosine, thymine, and uracil across two distinct samples. These pristine extraterrestrial materials confirm that the essential chemicals for biology existed in deep space long before life began on Earth.
Key points
Untouched asteroid materials confirm that all primary genetic nucleobases existed through…: Untouched asteroid materials confirm that all primary genetic nucleobases existed throughout the early Solar System.
Ryugu's samples were protected from Earth-based contamination, preserving a reliable 4.5-…: Ryugu's samples were protected from Earth-based contamination, preserving a reliable 4.5-billion-year-old chemical record.
Ancient celestial impacts likely helped deliver foundational prebiotic compounds directly…: Ancient celestial impacts likely helped deliver foundational prebiotic compounds directly to the surface of the early Earth.
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- Date:
- November 3, 2026
- Source:
- The Conversation
- Summary:
- Scientists have discovered all five essential nucleobases used in DNA and RNA in pristine samples from asteroid Ryugu, revealing that key ingredients for life existed in space billions of years ago. The remarkable finding adds to growing evidence from other asteroids and meteorites that these molecules were widespread throughout the early Solar System.
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A new study reveals all five fundamental nucleobases – the molecular “letters” of life – have been detected in samples from the asteroid Ryugu.
Asteroid particles offer a glimpse into the chemical ingredients that may have helped kindle life on Earth. The Ryugu samples were returned from space in 2020 by Japan Aerospace Exploration Agency’s (JAXA) Hayabusa2 mission.
In 2023, an international team reported they had found one of the nucleobases in these samples – uracil. Now, in a study published in Nature Astronomy, a team of Japanese scientists has confirmed all five nucleobases are present in this pristine asteroid material.
This means these ingredients for life may have been widespread…
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