Roughly 3.5 million years ago, the sky turned into a massive flare of bubbling gas shining out of the galaxy’s center — a true spectacle for the early ancestors of modern humans. And there’s a chance we could catch the next event with our own eyes.

The explosion, also known as a Fermi bubble, was essentially our galaxy discharging a huge quantity of nuclear energy, including deadly ionizing radiation emanating from the supermassive black hole at the center of the Milky Way.

And according to a new study published on the preprint site arXiv, the epic event took place about 3.5 million years ago.

The discovery is redefining how we’ve come to understand our galaxy — which has been far more active than we thought.

Astronomers have been observing much smaller “burps” of the center of the galaxy for decades, but never something quite this violent.

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