Scientists Make A Shocking Discovery Of RNA Molecules In Asteroid Dust Sample
An international team led by Associate Professor Yasuhiro Oba at Hokkaido University has been studying the samples from asteroid Ryugu since the samples were returned. What they have found is that the space rock contained uracil, one of the informational units (nucleobases) that makes up RNA, according to a recent post on Eureka Alert. The discovery provides evidence to support the possibility that important building blocks for life could have been brought to Earth by meteorites.

The team was able to extract the molecules from the samples by soaking the Ryugu particles in hot water, and then analyzing them with liquid chromatography coupled with high-resolution mass spectrometry. The process unveiled the traces of uracil and nicotinic acid, along with other nitrogen-containing organic compounds.

There were differences in the makeup of the two samples from Ryugu. Researchers hypothesize that the reason for this is due to the exposure to the extreme environments of space. They also think that the nitrogen-containing compounds, in part at least, formed from the simpler molecules, such as ammonia.
Oba believes the discovery of uracil in the samples give credence to current theories in regard to the source of nucleobases in the early stages of Earth's history. He concluded, "The OSIRIS-REx mission by NASA will returning samples from asteroid Bennu this year, and a comparative study of the composition of these asteroids will provide further data to build on these theories."