Asteroid Samples Found DNA’s Full Chemical Alphabet in Space
23rd March 2026
The case for life’s raw ingredients arriving from space just became harder to dismiss. In samples returned from the asteroid Ryugu, researchers identified all five nucleobases that make up DNA and RNA’s chemical alphabet: adenine, guanine, cytosine, thymine, and uracil. The finding does not show that life existed on the asteroid. It does show that some of biology’s most important molecular parts can form and persist in ancient space rock.