How are Fermi bubbles at the centre of our galaxy produced?

(Image credit:NASA) 
Fermi bubbles are large structures at the center of our galaxy, the Milky Way, that emit gamma rays. These structures were discovered in 2010 by the Fermi Gamma-Ray Space Telescope, hence their name.

The exact process by which Fermi bubbles are produced is not fully understood, but there are a few theories that have been proposed. One theory is that the Fermi bubbles are the result of a massive burst of energy from the supermassive black hole at the center of the Milky Way. This burst of energy could have been triggered by the accretion of a large amount of matter onto the black hole, or by the merging of two smaller black holes.

Another theory is that the Fermi bubbles are the result of a violent event such as a supernova explosion or the collision of two galaxies. This theory suggests that the Fermi bubbles are a relic of a past event that occurred in the Milky Way.

Regardless of their exact origin, it is clear that the Fermi bubbles are an important and fascinating feature of our galaxy. They are among the largest structures ever observed in the universe, and their properties can tell us a lot about the history and evolution of the Milky Way.