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These blobs were centered on the core of the Milky Way galaxy, but they extended above and below the plane of our galactic home for over 25,000 light-years.
They are gargantuan bubbles of high-energy gas emanating from the galactic center that extend above and below the galactic plane, for a total distance of 50,000 light-years, expanding at a rate of millions of miles an hour.
Now, in a new study published March 7 in the journal Nature Astronomy, researchers describe how they simulated the explosive history of the Fermi and eROSITA bubbles to determine exactly where, when and how they were created.
Using data from both the gamma-ray and X-ray surveys that uncovered the mysterious structures, the study authors show that both sets of bubbles likely resulted from a lengthy outburst from the supermassive black hole at the center of our galaxy, beginning 2.6 million years ago.
"According to our estimate of the jet power required to inflate the Fermi/eROSITA bubbles, the galactic black hole had a very good appetite," lead study author Karen Yang, an assistant professor at the National Tsing Hua University in Taiwan, told Live Science.
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