Two strange blobs of X-ray energy are swirling out of the galaxy’s center

Millions of years ago, a powerful explosion shook the center of the Milky Way, sending twin shock waves blasting across the sky. Those waves bulldozed through the galaxy, heating up all the gas and dust in their path and leaving two telltale blobs of hot, highly energized gamma-rays in their wake.

Today, those blobs — now named the Fermi Bubbles — span half the width of our galaxy. One lobe towers for 25,000 light-years above the Milky Way’s disk, and the other looms just as large below it. Since their discovery in 2010, the bubbles have been a monolithic mystery of our galaxy — and now we know they are not alone.

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