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Rather than a smooth ocean of gas, our galaxy is riddled with hollows, tunnels, and local hot bubbles – more like a gigantic cosmic sponge. In 2024, scientists at the Max Planck Institute for Extraterrestrial Physics turned to data from eROSITA, the X-ray telescope developed by the institute and operating aboard the Russian-German Spectrum- Roentgen-Gamma (SRG) mission. More importantly, by combining new eROSITA observations with earlier data from the ROSAT All-Sky survey, scientists were able to construct a far more precise three-dimensional map of the Local Bubble. “And, it appears that some of these super-bubbles may have tunnels connecting them to other bubbles or other structures, suggesting our Local Hot Bubble could be part of an intricate network of similar features throughout our galaxy.”Among the most surprising findings are tunnels or channels of hot plasma, stretching out from the LHB, appearing to connect our solar neighborhood to distant regions of the galaxy. These tunnels composed of hot low-density plasma, appear to act as conduits, linking our Solar System to distant star-forming regions and other galactic structures. It reveals a dynamic galactic ecosystem where tunnels and cavities facilitate the transfer of materials like gas and dust. So far, scientists have identified two interstellar tunnels within the Local Bubble. This connection positions the tunnels as crucial components in the Milky Way’s star formation cycle and enriches our understanding of how stars and planetary systems come into existence.
