X-ray monitoring examines explosion of 10 million
years ago

Researchers from Waseda University, the University of Tokyo, RIKEN and Kanazawa University found evidence that the Fermi bubbles erupting from the Galactic center and the giant loop structures observed from X-ray monitoring are both traces of a massive explosion which occurred 10 million years ago.

Their research was published in The Astrophysical Journal on July 25, 2018.