Astronomers Detect First True Sugar Molecule in Interstellar Space

A team of astronomers has detected erythrulose, a four-carbon sugar molecule, in a gas cloud near the center of the Milky Way — the first true sugar ever found in interstellar space, offering new clues to how life's building blocks may form throughout the cosmos.

Astronomers have made an extra-sweet discovery: the first true sugar molecule ever detected in interstellar space. A team led by Izaskun Jiménez-Serra at the Spanish National Research Council identified erythrulose — a four-carbon sugar — swirling inside a molecular cloud near the center of the Milky Way.

The finding, published in Nature Astronomy, marks the culmination of a decades-long hunt. While simpler molecules like glycolaldehyde (a two-carbon sugar-like compound) have been spotted before, erythrulose is the first with a true sugar backbone of at least three carbon atoms. "This is an incredibly exciting result," said Brett McGuire, an astrochemist at MIT. "Astronomers have, for a very long time, been pushing to detect sugars in space."

The breakthrough came when physical chemist Emilio Cocinero shared spectroscopic data for erythrulose with Jiménez-Serra's team. To their surprise, the molecular fingerprint matched observations from Spain's Yebes and IRAM radio telescopes.

Scientists have long suspected that sugars essential to life — like ribose, previously found in meteorite samples — originated in space and were delivered to Earth by impacts. The new detection strengthens that hypothesis and suggests the raw ingredients for life may be more common in the galaxy than previously thought.

Sources: Nature, Nature Astronomy