Scientists fear a devastating solar storm could undo centuries of progress and send mankind back to the dark ages.
The phenomenon which looks like a spectacular fireworks show has been spotted 100 light years away, which researchers have branded "troubling".
If the storm made its way to Earth, it would cut off power and phone networks across the world by frying satellites in orbit and crashing power grids.
The star has been dramatically named after the Latin word for dragon, EK Draconis, due to its fire breathing appearance in the constellation of Draco, in the far northern sky.
Known as a CME (coronal mass ejection), the Sun shoots out such eruptions on a regular basis.
They are made up of clouds of extremely-hot particles, or plasma, that hurtle through space at millions of miles an hour.
And they are potentially bad news for the Earth. Every 100 years or so, they are released in our direction.
Co-author of a study Dr Yuta Notsu, of the University of Colorado Boulder, said: "Coronal mass ejections can have a serious impact on Earth and human society."
The international team observed the astonishing burst of energy pouring out of EK Draconis and it was much more powerful than any seen before.
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Experts fear a catastrophic solar storm will hit humanity by the end of this century.
Study leader Kosuke Namekata, a PhD student at the National Astronomical Observatory of Japan, said it could be just as strong.
The researchers used ground and space based telescopes to peer at EK Draconis, which resembles a young version of the Sun.
It emitted a mass of scorching plasma in the quadrillions of kilograms which is over ten times bigger than the previous record from a Sun like star.
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Dr Notsu added: "It may serve as a warning of just how dangerous the weather in space can be.
"This kind of big mass ejection could, theoretically, also occur on our Sun.
"This observation may also help us to better understand how similar events may have affected Earth and even Mars over billions of years."
Two years ago researchers at the US Geological Survey predicted a solar storm could hit us at any moment, with no guarantee we'll spot it coming.
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They examined an event now known as the New York Railroad Storm, which plunged large parts of the northeastern United States into darkness in May 1921.
According to the report, several gigantic CMEs bombarded Earth at once, juicing up Earth's magnetic field and causing widespread destruction.
If it happened in the modern world, the cost would run into trillions of dollars.
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