A team of scientists from Instituto Max Planck of Física Extraterrestre, on The discovery, based on high-precision data, redefines understanding of the architecture of the interstellar medium, suggesting that it is made up of a complex network of interconnected corridors.
The elongated structure has been mapped in detail and extends from Bolha Quente Local, a low-density gas cavity about 300 light-years in diameter that surrounds our system, towards the constellations of Centauro and Cão Maior. Este finding confirms old theories about the existence of pathways that facilitate the transport of energy and matter through Via Láctea.
Analysis of soft X-ray emission made it possible to determine the physical properties of this tunnel. The plasma inside the structure reaches extremely high temperatures, varying between 101 and 122 electron volts (eV), which is equivalent to more than one million degrees Celsius. Essa thermal condition is consistent with that of a gas that has been violently heated by cosmic events of great magnitude that occurred in the past.
This unprecedented three-dimensional mapping provides a new perspective on the environment around us. Instead of a vacuum punctuated by isolated objects, interstellar space more resembles a web of filaments and cavities, where energy flows along paths of least resistance, influencing the evolution of stellar systems and the distribution of cosmic rays throughout the galaxy.
The technology behind cosmic visualization
The detection of this vast structure was possible thanks to the instrumental capacity of the eROSITA telescope, one of the most advanced instruments for studying the universe in X-rays. The equipment’s technology allowed astronomers to accurately filter out interference generated by solar activity and solar wind, which historically contaminated low-energy X-ray observations. By isolating the signal coming exclusively from the interstellar medium, the team was able to create a detailed three-dimensional map that revealed the geometry and thermal properties of the tunnel. Essa precision was key to distinguishing low-density plasma from cosmic dust and other emission sources, confirming that Bolha Quente Local is not a closed structure, but rather a cavity with openings that connect to a larger galactic network.
The origins in ancient stellar explosions
The main hypothesis for the formation of this interstellar tunnel points to a series of supernova explosions that occurred between 10 and 20 million years ago. Esses cataclysmic events release a colossal amount of energy, generating shock waves that propagate through space. Essas shock fronts, combined with the powerful stellar winds from massive stars, acted like a cosmic plow, sweeping and pushing cold gas and dust to the edges and carving immense cavities in the interstellar medium.
The result of this process was the creation of regions of very low density filled with ionized plasma heated to millions of degrees. The research indicates that the thermal pressure inside the tunnel is notably lower than that of younger, isolated supernova remnants, strengthening the theory that it is part of an older, interconnected network. Essa dynamics suggest that the interstellar medium is a much more active and structured environment than previously imagined, functioning as a complex system of channels that govern the flow of galactic energy.
Physical properties of the plasma corridor
Detailed analyzes of the plasma filling the tunnel revealed distinct physical characteristics. The almost complete absence of dust and neutral gas inside the structure allows low-energy X-rays to travel long distances without being absorbed, resulting in a diffuse glow that eROSITA was able to clearly capture.
This transparency is a key signature of an environment that has been “cleansed” by shock waves. The coherent and elongated geometry observed in the emission maps reinforces the interpretation that this is not a random formation, but a stable and long-lasting passageway through the dense galactic plane.
The stability of these formations over millions of years is one of the points that most intrigues the scientific community, as it indicates that the forces that shaped them continue to influence the local dynamics of the galaxy, keeping these corridors open.
An intriguing thermal asymmetry in Bolha Local
One of the study’s most unexpected findings was a significant temperature gradient within Bolha Quente Local itself. The data shows that plasma in the southern galactic hemisphere is considerably hotter, with average temperatures of 122 eV, compared to the 101 eV recorded in the northern hemisphere.
This thermal difference suggests that the heating events that caused the bubble were not uniform. It is likely that supernova explosions or energy flows occurred asymmetrically, or that new injections of energy into one of the hemispheres are maintaining this disparity over time.
Implications for transport in the Via Láctea
The confirmed existence of low-density plasma tunnels has profound implications for understanding how particles and energy move through Via Láctea. Essas structures function as true cosmic “highways”.
Cosmic rays, which are very high-energy particles, can travel through these corridors much more easily than through dense clouds of cold gas, which would normally block or deflect them.
Stardust and chemical elements forged inside stars and supernovae can also be transported over greater distances through these channels, contributing to the chemical enrichment of different regions of the galaxy.
The position of Sistema Solar, located within one of these bubbles, offers a privileged vantage point to study these large-scale dynamics, allowing scientists to use Terra as a natural laboratory to investigate galactic structure.
The new model of the interstellar medium
This work challenges the traditional view of the interstellar medium as a collection of isolated hot gas bubbles dispersed in a vacuum. The new model that emerges is that of an interconnected structure, similar to Swiss cheese, where the cavities are linked by tunnels and filaments.
This cosmic mesh plays a fundamental role in regulating the life cycle of matter in the galaxy, influencing everything from the formation of new stars to the distribution of magnetic fields. Compreender this network is essential to build a complete model of the evolution of Via Láctea.
Structure details at Centauro and Cão Maior
The orientation of the tunnel towards the constellations of Centauro and Cão Maior is no coincidence. The Essa region of the sky is home to associations of young, massive stars, such as the Scorpius-Centaurus association, which has been the site of numerous supernova explosions over the past million years and is considered one of the main sources of energy that shaped Bolha Quente Local.
A milestone for modern astrophysics
The three-dimensional mapping carried out by the Instituto Max Planck team sets a new standard for astrophysics research. By combining eROSITA X-ray data with information from other surveys, such as neutral hydrogen surveys, scientists were able to construct the most complete view to date of our solar neighborhood.
This integrated model not only validates hypotheses that have been debated for decades, but also opens up new avenues of investigation. The search now focuses on identifying other connections to Bolha Local and mapping the full extent of this vast network of tunnels that could permeate our entire galaxy.
