Anonymous15 days ago
Scientists analyzing pristine samples from asteroid Ryugu returned by Japan's Hayabusa2 spacecraft have confirmed the presence of all five canonical nucleobases—adenine, guanine, cytosine, thymine, and uracil—marking only the second asteroid where the complete genetic alphabet has been detected. The discovery, published in Nature Astronomy in March 2026, strengthens the hypothesis that carbonaceous asteroids seeded early Earth with the molecular building blocks necessary for life, while a surprising correlation between nucleobase ratios and ammonia concentrations points to previously unknown formation pathways in the early solar system.