A cataclysmic energy flare ripped through our galaxy, the Milky Way, about 3.5 million years ago, a team of astronomers say.
They say the so-called Sifter flare started near the super massive black hole in the centre of the galaxy.
The impact was felt 200,000 light-years away.
The discovery that the Milky Way’s centre was more dynamic than previously thought can lead to a complete reinterpretation of its evolution.
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“These results dramatically change our understanding of the Milky Way,” says co-author Magma Guglielmo from the University of Sydney.
“We always thought about our Galaxy as an inactive galaxy, with a not so bright centre,” she added.
The flare created two enormous “ionisation cones” that sliced through the Milky Way.
The team – led by Professor Joss Bland-Hawthorn from Australia – used the data gathered by the Hubble Space Telescope to calculate when the massive explosion of high-energy radiation took place.
The findings will be published in the Astrophysical Journal.