For decades, scientists have searched the depths of space for clues to one of humanity’s biggest mysteries: how life began. Now, a surprising discovery between distant stars is adding a compelling new piece to the puzzle. Researchers have detected a common type of sugar floating through interstellar space, fueling speculation that some of life’s essential ingredients may not be unique to Earth after all.
Scientists find a sugar molecule drifting between the stars
Astronomers have identified erythrulose, a naturally occurring sugar found on Earth in foods such as raspberries and even in some self-tanning products, floating in the interstellar medium — the vast regions of gas and dust that exist between stars. The discovery marks the first time a true sugar has been detected in this environment, offering new insight into how the chemical ingredients needed for life may form long before planets even exist. The findings were published on Monday in the journal Nature Astronomy.
Why this discovery matters
While erythrulose itself is not essential for life, sugars play a crucial role in biology. They provide energy for living cells and are key components of molecules such as DNA and RNA, which store and transmit genetic information.
Scientists are especially interested in understanding where these sugars come from because they are among the fundamental building blocks required for life. Finding one in interstellar space suggests that some of these ingredients may have formed naturally across the galaxy long before planets like Earth took shape.
How researchers found it
The international research team made the discovery by studying a massive molecular cloud — a cold, dense region of gas and dust — near the center of the Milky Way. Using highly sensitive radio telescopes in Spain, the scientists searched for unique molecular “fingerprints” emitted by chemicals in the cloud.
By comparing the radio signals collected from space with laboratory measurements on Earth, the researchers confirmed the presence of gaseous erythrulose. The study relied on observations from the Yebes 40-meter and IRAM 30-meter radio telescopes, which are designed to detect extremely faint molecular signatures from deep space.
Adding to a growing cosmic chemical collection
The latest discovery is part of a growing list of complex organic molecules found beyond Earth.
Over the past few decades, astronomers have detected compounds related to genetic material and other life-related chemistry in space. Researchers previously identified molecules related to sugars near the center of the Milky Way, while NASA’s OSIRIS-REx mission also found several sugars — including ribose, an important component of RNA — in samples returned from the asteroid Bennu.
The detection of erythrulose expands that catalog and ranks among the most complex sugar molecules ever identified in interstellar space.
Clues to the origins of life
One of the biggest questions in science is whether life’s essential ingredients were delivered to Earth by comets and asteroids or were already present in the cloud of gas and dust that eventually formed our solar system.
The new findings strengthen the idea that many of these molecules may have already existed before the Sun and planets formed. Laboratory models also suggest that erythrulose can be converted into other sugars considered more directly important to the chemical reactions that may have sparked the earliest forms of life.
Could similar ingredients exist elsewhere?
Because the sugar was detected in just one region of the galaxy, scientists believe it may also be present in countless other molecular clouds where new stars and planets are born.
If these life-related molecules are widespread throughout the Milky Way, the same chemical processes that helped prepare Earth for life could also be occurring elsewhere in the universe. Researchers plan to continue searching for additional sugars and related compounds to understand better how these molecules form and evolve across interstellar space.
Source:
AP News