Astronomers Discover Erythrulose Sugar in Milky Way Molecular Cloud

Whenever the idea of searching for life beyond Earth comes into picture, two key elements that are always a priority are water and oxygen. Now, astronomers have added another intriguing ingredient to the list: sugar. The latest research highlights that now scientists have discovered erythrulose, a naturally occurring four-carbon sugar found in raspberries, kiwis and other fruit, in a giant molecular cloud close to the center of the Milky Way. Sounds exciting? Well, the research, published in the journal Nature Astronomy, states that this is the first-ever detection of this type of sugar in interstellar space and provides new insight into how the building blocks of life could be created and distributed throughout the universe. Moreover, the finding provides insight not only into how life began on Earth but also the possibility that the same chemical processes may be occurring on distant planets.

What is Erythrulose?

According to science, erythrulose is a natural sugar found in trace amounts in fruit, such as raspberries, kiwis and pears. On Earth, it is best known for its role in food chemistry and cosmetic formulations. It is said to be a four-carbon sugar, unlike regular table sugar. Also, scientists claim that it can help to produce ribonucleotides, the molecular building blocks of RNA. According to the latest research, the discovery of erythrulose in space lends credence to the idea that the universe is brimming with the ingredients necessary for life.

What does the research states about Erythrulose

If the research is to be believed, the sugar was found in a dense molecular cloud near the centre of the Milky Way. For the uninitiated, molecular clouds are vast clouds of gas and dust where stars and planets are born and scientists often refer to these clouds as cosmic chemical laboratories because they allow simple atoms to combine to form more complex molecules. Researchers discovered it while studying the cloud using two radio telescopes in Spain. In the past, crowded regions made it difficult to detect sugars because signals from different molecules overlapped. But the new lab technique using lasers recently gave scientists the ability to reproduce the unique light signature of erythrulose, making it much easier to find the sugar's fingerprint in the cosmic noise. As per the study, the cloud was rich in erythrulose, but there was little sign of three-carbon sugars. This was not a gradual transition from simple three-carbon sugars to more complex four-carbon sugars.

Why sugar formation in space is now seen differently by scientists

Scientists believed for years that sugars in space were built up step by step. But, the new observations have put that theory to the test. Instead, the research team now believes that erythrulose is formed when two smaller organic molecules, each containing two carbon atoms, combine. If this alternative pathway is confirmed, it would alter scientists’ understanding of how complex organic molecules form in molecular clouds.

Did sugar from space help form life on Earth?

The origin of Earth’s first sugars is still a mystery to scientists. And if we go by past research, ribose and glucose have been detected on meteorites and asteroids, and scientists have hypothesized that strikes by space rocks brought many organic compounds to the young Earth. In the early history of the Earth, meteorites and cosmic dust may have delivered as much as 50 million tonnes of erythrulose to the planet, researchers estimate.

What is the takeaway for the search for alien life

According to experts, the discovery has major implications for astrobiology, the study of the origin of life and the possibility of life elsewhere in the universe. For the unversed, sugars are the building blocks of biology and ribose is the backbone of RNA and deoxyribose is an integral part of DNA. Erythrulose can help produce ribonucleotides, so the fact that it exists in space suggests that some of the key ingredients needed for life may already be there well before planets are formed. “Finding these sugars shows us that they are more common across the universe than we thought,” said lead author Izaskun Jiménez-Serra, a Spanish astrochemist at the Centre for Astrobiology.