Asteroid samples reveal key building blocks of life
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Japanese scientists analyzing samples from the asteroid Ryugu have discovered all five fundamental nucleobases, the molecular components of DNA and RNA, within the asteroid material.
The samples, brought back to Earth by Japan’s JAXA Hayabusa2 mission in 2020, provide a pristine look at the early Solar System’s chemistry. Researchers carefully extracted and purified organic molecules from the 5.4 grams of asteroid material using water and hydrochloric acid, ensuring minimal contamination.
This finding builds on previous discoveries made in meteorites that fell to Earth in Australia and France, which also contained nucleobases. However, the Ryugu samples are less likely to be contaminated by their journey, offering more reliable data. Scientists note that different asteroids show varying amounts of purines and pyrimidines, two types of nucleobases, potentially influenced by the presence of ammonia.
The presence of these molecules on asteroids like Ryugu, Bennu, and the parent body of the Orgueil meteorite suggests that the building blocks of life were widespread throughout the early Solar System. These discoveries support the idea that asteroids may have played a role in delivering these essential ingredients to the early Earth, contributing to the origin of life on our planet.
