Astronomers from the Spanish Center for Astrobiology have detected erythrose, a four-carbon sugar, in a massive molecular cloud near the center of the Milky Way. Published in Nature Astronomy, this discovery suggests that complex sugar molecules can form in interstellar space before stars and planets emerge, potentially influencing the origins of life.
Interstellar Sugar Discovery Challenges Chemical Models
Researchers identified the presence of erythrose using two radio telescopes to observe a dense molecular cloud located in the galactic center. This finding is significant because, while scientists have detected over 340 different molecules in interstellar space to date, sugars had previously remained elusive.
The team, led by primary researcher Jiménez-Serra, initially aimed to find simpler sugars containing only three carbon atoms. Instead, the detection of erythrose—a four-carbon sugar—surprised the team and challenged existing scientific assumptions regarding how interstellar molecules form. The researchers hypothesize that these sugars likely develop on the surfaces of dust particles coated in ice, where simpler molecules gradually combine through chemical reactions.
Implications for the Origins of Life on Earth
The discovery provides a new perspective on how the building blocks of life, such as DNA and RNA, might have reached Earth. These earlier findings led scientists to suspect that organic molecules necessary for life were formed in space and transported to Earth via asteroids or meteorites.
The research team estimates that during the “Late Heavy Bombardment” period—a time roughly in the ancient past when the solar system experienced a high frequency of asteroid impacts—a significant quantity of erythrose may have been deposited on the Earth’s surface. However, the scientific community continues to debate whether this period of intense bombardment actually occurred as described.
Scientific Goals and Future Observations
Beyond its role in cosmic chemistry, erythrose is known for its practical applications on Earth, where it is found in small quantities in some fruits and is frequently utilized in sunless tanning products to produce a bronze skin tone. For the research team, however, the focus remains on the broader implications for astrobiology.
The team plans to continue scanning the cosmos for other critical biological molecules. Their primary targets include ribose, a fundamental component of RNA, and other molecules that could help clarify the mechanisms behind the emergence of life. By identifying these complex structures in space, scientists hope to piece together a clearer picture of the chemical evolution that precedes the formation of habitable planetary systems.
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