A series of strong solar flares spewed from the Sun's surface sent a shockwave of magnetically charged plasma directly at the Earth producing extended vivid displays of colour across the skies.
The first extreme geomagnetic storm in two decades created a spectacular light show in UK skies on Friday night - and some parts of the country may have witnessed a colourful display once again on Saturday night. Friday night's event across parts of the Northern Hemisphere posed a threat to communication networks, navigation systems and power grids too.
Read more on Sky News:England's James Anderson announces retirement from Test cricketEurovision axes Dutch entry after controversy over 'incident' Severe solar storms can also create harmful geomagnetic induced currents in the power grid, leading to blackouts. The largest known geomagnetic event in history, known as the Carrington Event of 1859, caused telegraph machines to spark and catch fire.
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