Uncovering the Complexity of Galactic Bubbles

The eRosita X-ray telescope has revealed that the shells of the giant bubbles of high-energy gas that extend far above and below the Milky Way galaxy's center, known as "eRosita bubbles," are more complex than previously thought. These bubbles are larger and more energetic than their counterparts, the Fermi bubbles, and provide an exciting opportunity to study star formation history as well as reveal new clues about how the Milky Way came to be. The temperature of the gas within the bubbles isn't significantly different from the area outside of it, and the bubbles are so bright because they're filled with extremely dense gas, not because they are at hotter temperatures than the surrounding environment.