Astronomers have detected erythrulose, a four-carbon sugar, within a giant molecular cloud located near the center of the Milky Way [1, 2].

This discovery provides a potential link to the origins of life on Earth. Researchers said that these organic molecules could have been delivered to the early planet via comets and meteorites, offering the necessary building blocks for metabolism and RNA [3, 4].

The detection occurred in June 2026 [1]. The sugar was found in a massive cloud of gas and dust, a region known as a giant molecular cloud [1, 5]. While the substance is identified scientifically as erythrulose, it is also a type of sugar found in raspberries [1, 5].

The presence of such complex molecules in interstellar space challenges previous assumptions about how these chemicals form. Some researchers said that the sugar did not form in the way anyone expected [2].

Scientists estimate that millions of tonnes [6] of this sugar may have reached Earth during the formation of the Solar System. This influx of material could have fundamentally altered the chemical environment of the early Earth, facilitating the emergence of biological processes [3, 4].

The findings highlight the chemical richness of the Milky Way's center. By studying these distant clouds, astronomers can better understand the distribution of prebiotic molecules across the galaxy [1, 2].

“The discovery of erythrulose in a giant molecular cloud suggests organic building blocks may have reached early Earth via comets.”

The identification of erythrulose in deep space supports the theory of panspermia—the idea that life's essential chemical precursors are distributed throughout the universe. If complex sugars are common in giant molecular clouds, it increases the likelihood that other planetary systems possess the raw materials necessary for life to develop, suggesting that the conditions leading to Earth's biological origin may not be unique.