SAMPLES from asteroid Ryugu contain key elements of DNA and RNA: Here’s why it’s important for our HISTORY Samples from asteroid 162173 Ryugu have been found to contain all five nucleotide bases essential for DNA and RNA formation. The analysis, conducted by a team of Japanese scientists, revealed the presence of adenine, guanine, cytosine, thymine, and uracil. This discovery supports the hypothesis that carbon-rich asteroids may have contributed to the chemical composition of early Earth before life emerged.

• Samples from asteroid 162173 Ryugu contain all five nucleotide bases (adenine, guanine, cytosine, thymine, uracil) crucial for DNA and RNA.
• The findings come from an analysis of samples collected during Japan’s Hayabusa 2 mission.
• The ratio of purines to pyrimidines in Ryugu’s samples was approximately equal, unlike other analyzed asteroids.
• The presence of these compounds suggests their widespread distribution in the Solar System.
• This supports the hypothesis that carbon-rich asteroids could have seeded early Earth with the building blocks for life.
• Asteroid Ryugu was discovered in 1999 and has a diameter of about 0.92 kilometers.