A well-known enigma of the Milky Way has been unexpectedly clarified. Following decades of observations, scientists have confirmed that a mysterious structure possesses a different location and origin than previously believed.
!["The Galactic Center Lobe". Photo: Oxford/SARAO](/wp-content/uploads/2026/07/376d698d1da10ab21e3081272471c7c9.jpg ""The Galactic Center Lobe". Photo: Oxford/SARAO")
“The Galactic Center Lobe”. Photo: Oxford/SARAO
After nearly 40 years of research, astronomers have determined the true nature of a puzzling structure once thought to be connected to the center of the Milky Way. New observations reveal that the object is situated much closer to Earth than previously assumed, and its formation is unrelated to the activity of a supermassive black hole.
This was reported by the publication Science Alert.
The object, known as the Galactic Center Lobe (GCL), has remained one of astronomy’s greatest mysteries for decades. Due to its appearance, it resembled a vast “lobe” seemingly rising above the galactic center. Over years of study, scientists proposed various theories for its origin, ranging from the aftermath of supernova explosions to traces of a powerful eruption from the Milky Way’s core millions of years ago.
However, a new study has debunked these hypotheses. A team led by astrophysicist Katrin Kreckel from Heidelberg University has established that the enigmatic structure is not located at the Milky Way’s center. In reality, it is approximately 6,520 light-years from Earth, whereas the distance to the galactic center is about 26,000 light-years. Consequently, the actual dimensions of the object are considerably smaller than previously thought.
For their investigation, the team utilized data from the SDSS-V Local Volume Mapper project, which generates detailed maps of gas within the Milky Way. Observations of ionized sulfur emission played a crucial role. Its longer wavelengths penetrate cosmic dust more effectively, allowing scientists to perceive the lower portion of the structure, which had previously been obscured against the galactic plane.
This breakthrough revealed that the object is not an open “lobe” but rather a closed loop or gas bubble. Because of this, researchers have even suggested renaming it the “very convoluted loop.”
To ascertain the object’s distance, the scientists compared the degree of light dimming caused by cosmic dust with three-dimensional maps of dust distribution in the Milky Way. This confirmed that the structure is significantly nearer to our Solar System than previous research had indicated.
According to the study’s authors, the gas bubble is primarily composed of glowing hydrogen, which is ionized by intense ultraviolet radiation. Although the source of this radiation has not yet been identified, researchers hypothesize that the structure was formed by a previous generation of massive stars. Their supernova explosions might have created a cavity in the interstellar medium, and a subsequent generation of stars caused the gas to luminesce.
Scientists estimate the diameter of this gas bubble to be around 115 light-years. Its formation mechanism is similar to the well-known Barnard’s Loop, although it is smaller in scale.
Previously, scientists discovered a mysterious “super-Earth” with ideal conditions that could fundamentally alter our understanding of the universe.
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